WELLS FARGO BANK                                   REVOLVING LINE OF CREDIT NOTE

$10,000,000.00                                                  PHOENIX, ARIZONA
                                                                    JULY 14,1998

     FOR  VALUE  RECEIVED,   the   undersigned   KNIGHT   TRANSPORTATION,   INC.
("Borrower")  promises  to  pay to the  order  of  WELLS  FARGO  BANK,  NATIONAL
ASSOCIATION  ("Bank") at its office at Arizona RCBO #03839, 100 WEST WASHINGTON,
PHOENIX, AZ 86003, or at such other place as the holder hereof may designate, in
lawful money of the United States of America and in immediately available funds,
the principal sum of  $10,000,000.00,  or so much thereof as may be advanced and
be outstanding,  with interest thereon,  to be computed on each advance from the
date of its disbursement as set forth herein.

DEFINITIONS:

     As used herein, the following terms shall have the meanings set forth after
each,  and any other term  defined in this Note shall have the meaning set forth
at the place defined:

     (a) "Business Day" means any day except a Saturday, Sunday or any other day
on which commercial banks in Arizona are authorized or required by law to close.

     (b)  "Fixed  Rate Term"  means a period  commencing  on a Business  Day and
continuing for 1, 2, 3 or 6 months, as designated by Borrower,  during which all
or a portion of the  outstanding  principal  balance of this Note bears interest
determined in relation to LIBOR;  provided however,  that no Fixed Rate Term may
be selected for a principal amount less than $100,000.00;  and provided further,
that no Fixed Rate Term shall extend beyond the scheduled  maturity date hereof.
If any Fixed Rate Term would end on a day which is not a Business Day, then such
Fixed Rate Term shall be extended to the next succeeding Business Day.

     (c) "LIBOR" means the rate per annum (rounded upward, if necessary,  to the
nearest  whole 1/8 of 1 %)  determined  by dividing  Base LIBOR by a  percentage
equal to 100% less any LIBOR Reserve Percentage.

         (i) "Base  LIBOR"  means the rate per annum for  United  States  dollar
deposits  quoted  by  Bank as the  Inter-Bank  Market  Offered  Rate,  with  the
understanding  that such rate is quoted by Bank for the  purpose of  calculating
effective rates of interest for loans making reference thereto, on the first day
of a Fixed  Rate  Term for  delivery  of funds on said date for a period of time
approximately  equal to the  number  of days in such  Fixed  Rate Term and in an
amount approximately equal to the principal amount to which such Fixed Rate Term
applies. Borrower understands and agrees that Bank may base its quotation of the
Inter-Bank  Market  Offered Rate upon such offers or other market  indicators of
the Inter-Bank Market as Bank in its discretion deems appropriate including, but
not  limited  to,  the rate  offered  for U.S.  dollar  deposits  on the  London
Inter-Bank Market.

         (ii) "LIBOR Reserve Percentage" means the reserve percentage prescribed
by the Board of Governors of the Federal  Reserve  System (or any successor) for
"Eurocurrency  Liabilities"  (as defined in Regulation D of the Federal  Reserve
Board,  as  amended),  adjusted  by Bank for  expected  changes in such  reserve
percentage during the applicable Fixed Rate Term.

     (d)  "Prime  Rate"  means at any time the rate of  interest  most  recently
announced  within  Bank at its  principal  office  as its Prime  Rate,  with the
understanding  that the Prime Rate is one of Bank's base rates and serves as the
basis upon which  effective  rates of interest  are  calculated  for those loans
making reference  thereto,  and is evidenced by the recording  thereof after its
announcement in such internal publication or publications as Bank may designate.

INTEREST:

     (a) INTEREST.  The  outstanding  principal  balance of this Note shall bear
interest  (computed on the basis of a 360-day year,  actual days elapsed) either
(i) at a fluctuating  rate per annum EQUAL TO the Prime Rate in effect from time
to time,  or (ii) at a fixed  rate per annum  determined  by Bank to be  .62500%
above LIBOR in effect on the first day of the applicable  Fixed Rate Term.  When
interest is determined in relation to the Prime Rate, each change in the rate of
interest  hereunder shall become effective on the date each Prime Rate change is
announced within Bank. With respect to each LIBOR selection  hereunder,  Bank is
hereby authorized to note the date,  principal  amount,  interest rate and Fixed
Rate Term  applicable  thereto and any payments made thereon on Bank's books and
records (either manually or by electronic entry) and/or on any schedule attached
to this Note,  which  notations shall be prima facie evidence of the accuracy of
the information noted.

                                       1

     (b)  SELECTION OF INTEREST  RATE  OPTIONS.  At any time any portion of this
Note bears  interest  determined  in relation to LIBOR,  it may be  continued by
Borrower at the end of the Fixed Rate Term  applicable  thereto so that all or a
portion  thereof bears  interest  determined in relation to the Prime Rate or to
LIBOR for a new Fixed Rate Term designated by Borrower.  At any time any portion
of this Note bears interest  determined in relation to the Prime Rate,  Borrower
may convert all or a portion  thereof so that it bears  interest  determined  in
relation to LIBOR for a Fixed Rate Term designated by Borrower.  At such time as
Borrower  requests an advance  hereunder  or wishes to select a LIBOR option for
all or a portion of the outstanding  principal balance hereof, and at the end of
each Fixed Rate  Term,  Borrower  shall  give Bank  notice  specifying:  (i) the
interest rate option  selected by Borrower;  (ii) the principal  amount  subject
thereto; and (iii) for each LIBOR selection,  the length of the applicable Fixed
Rate Term. Any such notice may be given by telephone so long as, with respect to
each LIBOR selection,  (A) Bank receives written  confirmation from Borrower not
later than 3 Business Days after such  telephone  notice is given,  and (B) such
notice is given to Bank prior to 10:00 a.m.,  California time, of) the first day
of the Fixed Rate Term. For each LIBOR option  requested  hereunder,  Batik will
quote the  applicable  fixed  rate to  Borrower  at  approximately  10:00  a.m.,
California  time,  on the first day of the Fixed Rate Term. if Borrower does not
immediately  accept  the rate  quoted  by Bank,  any  subsequent  acceptance  by
Borrower shall be subject to a  redetermination  by Bank of the applicable fixed
rate; provided however, that if Borrower fails to accept any such rate by 11 :00
a.m.,  California  time, on the Business Day such  quotation is given,  then the
quoted  rate shall  expire and Bank shall have no  obligation  to permit a LIBOR
option to be selected on such day.  If no  specific  designation  of interest is
made at the time any advance is  requested  hereunder or at the end of any Fixed
Rate Term, Borrower shall be deemed to have made a Prime Rate interest selection
for such advance or the principal amount to which such Fixed Rate Term applied.

     (c) ADDITIONAL LIBOR PROVISIONS.

     (i) If Bank at any time shall  determine  that for any reason  adequate and
reasonable means do not exist for ascertaining  LIBOR,  then Bank shall promptly
give notice  thereof to Borrower.  If such notice is given and until such notice
has been  withdrawn  by Bank,  then (A) no new LIBOR  option may be  selected by
Borrower,  and (B) any portion of the outstanding principal balance hereof which
bears  interest  determined  in relation to LIBOR,  subsequent to the end of the
Fixed Rate Term applicable  thereto,  shall bear interest determined in relation
to the Prime Rate.

     (ii) If any law,  treaty,  rule,  regulation or determination of a court or
governmental  authority  or  any  change  therein  or in the  interpretation  or
application  thereof  (each,  a "Change in Law") shall make it unlawful for Bank
(A) to make LIBOR options available hereunder, or (8) to maintain interest rates
based  on  LIBOR,  then in the  former  event,  any  obligation  of Bank to make
available such unlawful LIBOR options shall immediately be cancelled, and in the
latter event,  any such unlawful  LIBOR-based  interest  rates then  outstanding
shall be  converted,  at Bank's  option,  so that interest on the portion of the
outstanding  principal  balance subject thereto is determined in relation to the
Prime Rate;  provided  however,  that if any such Change in Law shall permit any
LIBOR-based interest rates to remain in effect until the expiration of the Fixed
Rate Term applicable  thereto,  then such permitted  LIBOR-based  interest rates
shall continue in effect until the expiration of such Fixed Rate Term.  Upon the
occurrence  of  any  of  the  foregoing  events,  Borrower  shall  pay  to  Bank
immediately  upon demand such amounts as may be necessary to compensate Bank for
any fines, fees,  charges,  penalties or other costs incurred or payable by Bank
as a result  thereof  and  which are  attributable  to any  LIBOR  options  made
available to Borrower  hereunder,  and any  reasonable  allocation  made by Bank
among its operations shall be conclusive and binding upon Borrower.

     (iii) If any  Change  in Law or  compliance  by Bank  with any  request  or
directive  (whether  or not  having the force of law) from any  central  bank or
other governmental authority shall:

     (A)  subject  Bank to any tax,  duty or other  charge  with  respect to any
          LIBOR options,  or change the basis of taxation of payments to Bank of
          principal,  interest,  fees  or any  other  amount  payable  hereunder
          (except  for  changes in the rate of tax on the  overall net income of
          Bank); or

     (B)  impose,  modify  or hold  applicable  any  reserve,  special  deposit,
          compulsory  loan  or  similar  requirement  against  assets  held  by,
          deposits or other  liabilities  in or for the account of,  advances or
          loans by, or any other acquisition of funds by any office of Bank; or

     (C)  impose on Bank any other condition;

and the  result  of any of the  foregoing  is to  increase  the  cost to Bank of
making, renewing or maintaining any LIBOR options hereunder and/or to reduce any
amount  receivable  by Bank in  connection  therewith,  then in any  such  case,
Borrower  shall pay to Bank  immediately  upon  demand  such  amounts  as may be
necessary to compensate  Bank for any  additional  costs incurred by Bank and/or
reductions  in amounts  received  by Bank which are  attributable  to such LIBOR
options.  In  determining  which costs  incurred by Bank  and/or  reductions  in
amounts received by Bank are attributable to any LIBOR options made available to
Borrower hereunder,  any reasonable allocation made by Bank among its operations
shall be conclusive and binding upon Borrower.

     (d) PAYMENT OF INTEREST.  Interest accrued on this Note shall be payable on
the 15th day of each month, commencing JULY 15, 1998.

     (e) DEFAULT  INTEREST.  From and after the maturity  date of this Note,  or
such earlier date as all principal  owing  hereunder  becomes due and payable by
acceleration or otherwise,  the outstanding principal balance of this Note shall
bear interest until paid in full at an increased rate per annum (computed on the
basis of a 360-day  year,  actual  days  elapsed)  equal to 4% above the rate of
interest from time to time applicable to this Note.

                                       2

     (f)  UNUSED  COMMITMENT  FEE.  Borrower  shall  pay to Bank a fee  equal to
 .06200% per annum (computed on the basis of a 360-day year, actual days elapsed)
on the average  unused  amount of this Note,  which fee shall be calculated on a
monthly basis by Bank and shall be due and payable by borrower in arrears on the
15th day of each month.

     (g)  COLLECTION  OF  PAYMENTS.  Borrower  authorizes  Bank to  collect  all
interest and fees due hereunder by charging  Borrower's  demand deposit  account
number  4159-518950 with Bank, or any other demand deposit account maintained by
any  Borrower  with  Bank,  for  the  full  amount  thereof.   Should  there  be
insufficient  funds in any such demand deposit account to pay all such sums when
due, the full amount of such deficiency  shall be immediately due and payable by
Borrower.

STANDBY LETTER OF CREDIT SUBFEATURE:

     (a) LETTER OF CREDIT  SUBFEATURE.  As a  subfeature  under this Note,  Bank
agrees  from time to time  during the term  hereof to issue  standby  letters of
credit for the  account of  Borrower  to finance  WORKING  CAPITAL  REQUIREMENTS
(each,  a "Letter of Credit" and  collectively,  "Letters of Credit");  provided
however,  that the form and  substance of each Letter of Credit shall be subject
to approval by Bank,  in its sole  discretion;  and provided  further,  that the
aggregate  undrawn amount of all outstanding  Letters of Credit shall not at any
time exceed $1,250,000.00.  Each Letter of Credit shall be issued for a term not
to exceed 360 days, as designated by Borrower;  provided however, that no Letter
of Credit shall have an expiration  date subsequent to the maturity date of this
Note. The undrawn amount of all Letters of Credit shall be reserved  tinder this
Note and shall not be available for borrowings hereunder.  Each Letter of Credit
shall be subject to the additional  terms and conditions of the Letter of Credit
Agreement and related documents, if any, required by Bank in connection with the
issuance  thereof.  Each draft  paid by Bank  under a Letter of Credit  shall be
deemed an advance  under this Note and shall be repaid by Borrower in accordance
with the terms and conditions of this Note;  provided however,  that if advances
hereunder are not  available,  for any reason,  at the time any draft is paid by
Bank, then Borrower shall immediately pay to Bank the full amount of such draft,
together with interest  thereon from the date such amount is paid by Bank to the
date such amount is fully repaid by Borrower, at the rate of interest applicable
to advances  hereunder.  In such event,  Borrower  agrees that Bank, in its sole
discretion,  may debit any demand  deposit  account  maintained by Borrower with
Bank for the amount of any such draft.

     (b)  LETTER OF CREDIT  FEES.  Borrower  shall pay to Bank (i) fees upon the
issuance of each  Letter of Credit  equal to 0.900% per annum  (computed  on the
basis of a 360-day year,  actual days elapsed) of the face amount  thereof,  and
(ii) fees upon the  payment by Bank of each draft under any Letter of Credit and
upon the  occurrence of any other  activity with respect to any Letter of Credit
(including without  limitation,  the transfer,  amendment or cancellation of any
Letter of Credit) determined in accordance with Bank's standard fees and charges
then in effect for such activity.

BORROWING AND REPAYMENT:

     (a) USE OF PROCEEDS.  Advances under this Note shall be available solely to
finance WORKING CAPITAL REQUIREMENTS.

     (b) BORROWING AND REPAYMENT. Borrower may from time to time during the term
of this Note borrow,  partially or wholly repay its outstanding borrowings,  and
reborrow,  subject to all of the limitations,  terms and conditions of this Note
and of any document  executed in connection with, or at any time as a supplement
to, this Note;  provided however,  that the total  outstanding  borrowings under
this Note shall not at any time exceed the principal  amount  stated above.  All
payments  credited  to  principal  shall be applied  first,  to the  outstanding
principal  balance of this Note which bears  interest  determined in relation to
the Prime Rate, if any, and second, to the outstanding principal balance of this
Note which bears  interest  determined in relation to LIBOR,  with such payments
applied to the oldest  Fixed Rate Term first.  The unpaid  principal  balance of
this obligation at any time shall be the total amounts advanced hereunder by the
holder  hereof less the amount of any  principal  payments made hereon by or for
any  Borrower,  which  balance may be  endorsed  hereon from time to time by the
holder. The outstanding  principal balance of this Note shall be due and payable
in full on JULY 15, 2000.

     (c) ADVANCES.  Advances hereunder, to the total amount of the principal sum
available hereunder, may be made by the holder at the oral or written request of
(i) L. RANDY KNIGHT or KEVIN P. KNIGHT or CLARK JENKINS or GARY KNIGHT,  any one
acting alone,  who are authorized to request advances and direct the disposition
of any advances  until written  notice of the  revocation  of such  authority is
received by the holder at the office designated above, or (ii) any person,  with
respect to advances  deposited to the credit of any account of any Borrower with
the holder, which advances, when so deposited, shall be conclusively presumed to
have been made to or for the  benefit of each  Borrower  regardless  of the fact
that persons other than those  authorized to request advances may have authority
to draw against such  account.  The holder shall have no obligation to determine
whether  any  person  requesting  an advance  is or has been  authorized  by any
Borrower.

                                       3

PREPAYMENT:

     (a) PRIME RATE.  Borrower may prepay  principal on any portion of this Note
which bears  interest  determined  in relation to the Prime Rate at any time, in
any amount and without penalty.

     (b) LIBOR.  Borrower may prepay principal on any portion of this Note which
bears  interest  determined  in relation to LIBOR at any time and in the minimum
amount of  $100,000.00;  provided  however,  that if the  outstanding  principal
balance  of such  portion  of this Note is less than said  amount,  the  minimum
prepayment amount shall be the entire outstanding  principal balance thereof. In
consideration  of Bank providing this prepayment  option to Borrower,  or if any
such  portion of this Note shall become due and payable at any time prior to the
last day of the Fixed Rate Term applicable thereto by acceleration or otherwise,
Borrower shall pay to Bank immediately upon demand a fee which is the sum of the
discounted  monthly  differences  for each  month  from the month of  prepayment
through the month in which such Fixed Rate Tern) matures,  calculated as follows
for each such month:

         (i)  DETERMINE  the amount of interest  which would have  accrued  each
month on the amount  prepaid at the interest rate  applicable to such amount had
it  remained  outstanding  until the last day of the Fixed Rate Term  applicable
thereto.

         (ii)  SUBTRACT  from the amount  determined  in (i) above the amount of
interest  which would have accrued for the same month on the amount  prepaid for
the  remaining  term of such  Fixed  Rate Term at LIBOR in effect on the date of
prepayment  for new loans made for such term and in a principal  amount equal to
the amount prepaid.

         (iii) If the  result  obtained  in (ii) for any month is  greater  than
zero, discount that difference by LIBOR used in (ii) above.

Each  Borrower  acknowledges  that  prepayment of such amount may result in Bank
incurring  additional  costs,  expenses  and/or  liabilities,  and  that  it  is
difficult  to  ascertain  the  full  extent  of  such  costs,   expenses  and/or
liabilities.  Each  Borrower,  therefore,  agrees  to  pay  the  above-described
prepayment fee and agrees that said amount  represents a reasonable  estimate of
the prepayment costs,  expenses and/or liabilities of Bank. If Borrower fails to
pay any  prepayment  fee when  due,  the  amount  of such  prepayment  fee shall
thereafter  bear interest  until paid at a rate per annum 2.000% above the Prime
Rate in effect  from  time to time  (computed  on the  basis of a 360-day  year,
actual days  elapsed).  Each change in the rate of interest on any such past due
prepayment  fee shall  become  effective  on the date each Prime Rate  change is
announced within Bank.

EVENTS OF DEFAULT:

     Any  default in the payment or  performance  of any  obligation  under this
Note,  or any defined  event of default  under any loan  agreement now or at any
time hereafter in effect between  Borrower and Bank (whether  executed prior to,
concurrently with or at any time after this Note), shall constitute an "Event of
Default" under this Note.

MISCELLANEOUS:

     (a) REMEDIES.  Upon the  occurrence of any Event of Default,  the holder of
this Note, at the holder's option, may declare all sums of principal,  interest,
fees and charges outstanding hereunder to be immediately due and payable without
presentment,  demand,  notice of nonperformance,  notice of protest,  protest or
notice of dishonor,  all of which are expressly waived by each Borrower, and the
obligation,  it any, of the holder to extend any further credit  hereunder shall
immediately  cease  and  terminate.  Each  Borrower  shall  pay  to  the  holder
immediately  upon demand the full  amount of all  payments.  advances,  charges,
costs and expenses,  including  reasonable  attorneys'  fees (to include outside
counsel fees and all allocated costs of the holder's in-house counsel), expended
or incurred by the holder in  connection  with the  enforcement  of the holder's
rights and/or the collection of any amounts which become due to the holder under
this Note,  and the  prosecution  or defense of any action in any way related to
this Note,  including  without  limitation,  any action for declaratory  relief,
whether incurred at the trial or appellate  level, in an arbitration  proceeding
or otherwise, and including any of the foregoing incurred in connection with any
bankruptcy proceeding  (including without limitation,  any adversary proceeding,
contested  matter or motion brought by Bank or any other person) relating to any
Borrower or any other person or entity.

     (b)  OBLIGATIONS  JOINT AND SEVERAL.  Should more than one person or entity
sign this Note as a Borrower,  the  obligations  of each such Borrower  shall be
joint and several.

     (c)  GOVERNING  LAW.  This  Note  shall be  governed  by and  construed  in
accordance with the laws of the state of Arizona.

     IN WITNESS  WHEREOF,  the undersigned has executed this Note as of the date
first written above.

KNIGHT TRANSPORTATION INC.

By: /s/ Clark Jenkins
- ---------------------------------
CLARK JENKINS
CHIEF FINANCIAL OFFICER/SECRETARY

                                       4

WELLS FARGO BANK                                                  LOAN AGREEMENT

     This Loan  Agreement  (this  "Agreement")  is entered  into by and  between
KNIGHT  TRANSPORTATION,   INC.  ("Borrower")  and  WELLS  FARGO  BANK,  NATIONAL
ASSOCIATION  ("Bank") and sets forth the terms and  conditions  which govern all
Borrower's  commercial credit  accommodations from Bank, whether now existing or
hereafter  granted (each, a "Credit" and collectively,  "Credits"),  which terms
and  conditions  are in  addition  to those  set  forth in any  other  contract,
instrument or document (collectively with this Agreement,  the "Loan Documents")
required by this Agreement or heretofore or at any time  hereafter  delivered to
Bank in connection with any Credit.

     I.   REPRESENTATIONS   AND   WARRANTIES.   Borrower   makes  the  following
representations  and warranties to Bank,  which  representations  and warranties
shall be true as of the date hereof and on the date of each  extension of credit
under each Credit with the same effect as though made on each such date:

     (a) LEGAL STATUS.  Borrower is a  CORPORATION,  duly organized and existing
and in good standing under the laws of the State of ARIZONA, and is qualified or
licensed to do  business in all  jurisdictions  in which such  qualification  or
licensing is required or in which the failure to be qualified or licensed  could
have a material adverse effect on Borrower.

     (b)  AUTHORIZATION  AND VALIDITY.  Each of the Loan Documents has been duly
authorized, and upon its execution and delivery to Bank will constitute a legal,
valid and binding  obligation of Borrower or the party which  executes the same,
enforceable in accordance with its respective terms.

     (c) NO VIOLATION.  The execution,  delivery and  performance by Borrower of
each of the Loan Documents do not violate any provision of law or regulation, or
contravene any provision of Borrower's  Articles of Incorporation or By-Laws, or
result in any  breach of or  default  under any  agreement,  indenture  or other
instrument to which Borrower is a party or by which Borrower may be bound.

     (d) NO  LITIGATION.  There  are no  pending,  or to the best of  Borrower's
knowledge threatened,  actions, claims, investigations,  suits or proceedings by
or before any governmental authority, arbitrator, court or administrative agency
which  could  have a  material  adverse  effect on the  financial  condition  or
operation of Borrower  except as disclosed by Borrower to Bank in writing  prior
to the date hereof.

     (e) FINANCIAL  STATEMENTS.  The most recent annual  financial  statement of
Borrower,  and all interim financial statements delivered to Bank since the date
of said annual financial statement,  true copies of which have been delivered by
Borrower to Bank prior to the date hereof,  are  complete  and correct,  present
fairly the  financial  condition of Borrower and  disclose  all  liabilities  of
Borrower,   and  have  been  prepared  in  accordance  with  generally  accepted
accounting  principles.  Since the dates of such financial  statements there has
been no material adverse change in the financial condition of Borrower,  nor has
Borrower  mortgaged,  pledged,  granted  a  security  interest  in or  otherwise
encumbered  any of its  assets  or  properties  except  in  favor  of Bank or as
otherwise permitted by Bank in writing.

     (f) TAX RETURNS.  Borrower has no knowledge of any pending  assessments  or
adjustments  of its  income  tax  payable  with  respect  to any year  except as
disclosed by Borrower to Bank in writing prior to the date hereof.

     II. ADDITIONAL TERMS.

     (a)  CONDITIONS  PRECEDENT.  The  obligation of Bank to grant any Credit is
subject  to  the  condition   that  Bank  shall  have  received  all  contracts,
instruments and documents,  duly executed where applicable,  deemed necessary by
Bank to evidence such Credit and all terms and  conditions  applicable  thereto,
all of which shall be in form and substance satisfactory to Bank.

     (b)  APPLICATION  OF  PAYMENTS.  Each  payment made on each Credit shall be
applied first,  to any interest then due,  second,  to any fees and charges then
due, and third, to the outstanding principal balance thereof.

     III.  COVENANTS.  So long as any Credit  remains  available  or any amounts
under any Credit  remain  outstanding,  Borrower  shall,  unless Bank  otherwise
consents in writing:

     (a)  INSURANCE.  Maintain  and keep in force,  for each  business  in which
Borrower is engaged,  insurance of the types and in amounts  customarily carried
in similar  lines of  business,  including  but not  limited  to fire,  extended
coverage, public liability,  property damage and workers' compensation,  carried
with  companies and in amounts  satisfactory  to Bank,  and deliver to Bank from
time to time at Bank's  request  schedules  setting forth all insurance  then in
effect.

                                       5

     (b) COMPLIANCE: LAWS AND REGULATIONS; YEAR 2000.

          (i)  Preserve  and  maintain  all  licenses,   permits,   governmental
approvals,  rights,  privileges  and  franchises  necessary  for the  conduct of
Borrower's business; and comply with the provisions of all documents pursuant to
which Borrower is organized arid/or which govern Borrower's  continued existence
and with the  requirements of all laws,  rules,  regulations  arid orders of any
governmental authority applicable to Borrower and/or its business, and all state
or federal environmental, hazardous waste, health arid safety statutes, arid any
rules or  regulations  adopted  pursuant  thereto,  which  govern or affect  any
operations and/or properties of Borrower.

         (ii) Perform all acts reasonably  necessary to ensure that (A) Borrower
and any business in which  Borrower  holds a substantial  interest,  and (B) all
customers,  suppliers  and vendors  that are  material to  Borrower's  business,
become Year 2000 Compliant in a timely manner. Such acts shall include,  without
limitation,   performing  a  comprehensive  review  and  assessment  of  all  of
Borrower's  systems and adopting a detailed plan, with itemized budget,  for the
remediation,  monitoring and testing of such systems. As used herein, "Year 2000
Compliant"  shall mean, in regard to any entity,  that all  software,  hardware,
firmware,  equipment,  goods or systems  utilized by or material to the business
operations or financial  condition of such entity,  will  properly  perform date
sensitive  functions  before,  during and after the year 2000.  Borrower  shall,
immediately upon request,  provide to Bank such certifications or other evidence
of  Borrower's  compliance  with the terms  hereof as Bank may from time to time
require.

     (c) OTHER  INDEBTEDNESS.  Not create,  incur, assume or permit to exist any
indebtedness  or other  liabilities,  whether  secured or unsecured,  matured or
unmatured,  liquidated or unliquidated,  joint or several,  direct or contingent
(including any contingent liability under any guaranty of the obligations of any
person or entity),  except (i) the  liabilities of Borrower to Bank,  Iii) trade
debt incurred by Borrower in the normal  course of its  business,  and (iii) any
other  liabilities of Borrower  existing as of, and disclosed to Bank in writing
prior to, the date hereof.

     (d)  MERGER;   CONSOLIDATION;   TRANSFER  OF  ASSETS.  Not  merge  into  or
consolidate with any other entity; nor make any substantial change in the nature
of  Borrower's  business as conducted as of the date hereof;  nor acquire all or
substantially all of the assets of any other person or entity;  nor sell, lease,
transfer or otherwise  dispose of all or a  substantial  or material  portion of
Borrower's assets except in the ordinary course of its business.

     (e)  PLEDGE OF ASSETS.  Not  mortgage,  pledge,  grant or permit to exist a
security  interest in, or lien upon, all or any portion of Borrower's assets now
owned or  hereafter  acquired,  except  in favor of Bank and  except  any of the
foregoing  existing as of, and  disclosed to Bank in writing  prior to, the date
hereof.

     (f) FINANCIAL STATEMENTS. Provide to Bank all of the following, in form and
detail  satisfactory  to Bank,  together  with such current  financial and other
information as Bank from time to time may reasonably request:

         (i) As soon as available, but in no event later than 120 days after and
as of the end of each FISCAL year, AN AUDITED  financial  statement of Borrower,
prepared by an independent  certified public  accountant  acceptable to Bank, to
include a balance sheet,  income statement and statement of cash flow,  together
with all supporting schedules and footnotes.

         (ii) As soon as available, but in no event later than 60 days after and
as of the end of  EACH  FISCAL  QUARTER,  a  financial  statement  of  Borrower,
prepared  by  Borrower  and  certified  as correct  by an  officer  of  Borrower
authorized  to borrow  under the Most  current  Corporate  Borrowing  Resolution
delivered by Borrower to Bank, to include a balance sheet and income  statement,
together with all supporting schedules and footnotes.

     (g) Financial Condition. Maintain Borrower's financial condition as follows
using generally accepted  accounting  principles  consistently  applied and used
consistently  with  prior  practices,  except  to  the  extent  modified  by the
following definitions:

         (i) Current Ratio not at any time less than 1.00 to 1 .0, with "Current
Ratio" defined as total current assets divided by total current liabilities.

         (ii) Tangible Net Worth not at any time less than $50,000,000.00,  with
"Tangible Net Worth" defined as the aggregate of total stockholders' equity plus
subordinated debt less any intangible assets.

         (iii) Total  Liabilities  divided by Tangible Net Worth not at any time
greater than 1.00 to 1.0, with "Total  Liabilities"  defined as the aggregate of
current liabilities and non-current liabilities less subordinated debt, and with
"Tangible Net Worth" as defined above.

                                       6

     IV. DEFAULT; REMEDIES.

     (a)  EVENTS  OF  DEFAULT.  The  occurrence  of any of the  following  shall
constitute an "Event of Default" under this Agreement:

         (i) The failure to pay any principal,  interest,  fees or other charges
when due under any of the Loan Documents.

         (ii) Any  representation or warranty  hereunder or under any other Loan
Document  shall  prove to be  incorrect,  false or  misleading  in any  material
respect when made.

         (iii)  Any  violation  or  breach  of any  term  or  condition  of this
Agreement or any other of the Loan ocuments.

         (iv) Any default in the payment or  performance of any  obligation,  or
any defined event of default,  under any provisions of any contract,  instrument
or document  pursuant to which Borrower or any guarantor  hereunder has incurred
debt or any other liability of any kind to any person or entity, including Bank.

         (v) The filing of a petition by or against  Borrower  or any  guarantor
hereunder  under any  provisions of the  Bankruptcy  Reform Act, Title 11 of the
United  States Code,  as amended or  recodified  from time to time, or under any
similar or other law relating to bankruptcy, insolvency, reorganization or other
relief for  debtors;  the  appointment  of a  receiver,  trustee,  custodian  or
liquidator  of or for any part of the assets or property of Borrower or any such
guarantor;  Borrower or any such guarantor  becomes  insolvent,  makes a general
assignment  for the benefit of creditors or is generally not paying its debts as
they become due; or any  attachment  or like levy on any property of Borrower or
any such guarantor.

         (vi) Any material adverse change,  as determined solely by Bank, in the
financial condition of Borrower.

         (vii) The death or incapacity of any individual guarantor hereunder; or
the  dissolution or liquidation of Borrower or of any guarantor  hereunder which
is a corporation, partnership or other type of entity.

         (viii) Any change in  ownership  during the term hereof of an aggregate
of 25% or more of the common stock of Borrower.

     (b) REMEDIES.  Upon the occurrence of any Event of Default:  (i) the entire
balance of principal, interest, fees and charges on each Credit shall, at Bank's
option, become immediately due and payable in full without presentment; "demand,
protest or notice of dishonor,  all of which are  expressly  waived by Borrower;
(ii) the  obligation,  if any, of Bank to extend any further  credit to Borrower
under any Credit shall  immediately  cease and  terminate;  and (iii) Bank shall
have all rights, powers and remedies available under each of the Loan Documents,
or  accorded by law,  including  without  limitation  the right to resort to any
security  for any  Credit,  All  rights,  powers and  remedies  of Bank shall be
cumulative.

     V. MISCELLANEOUS.

     (a) NO WAIVER.  No delay,  failure or  discontinuance of Bank in exercising
any  right,  power or remedy  under any of the Loan  Documents  shall  affect or
operate  as a waiver of such  right,  power or  remedy;  nor shall any single or
partial exercise of any such right, power or remedy preclude, waive or otherwise
affect any other or further exercise thereof or the exercise of any other right,
power or remedy. Any waiver,  permit, consent or approval of any kind by Bank of
any  breach  of or  default  under  this  Agreement,  or any such  waiver of any
provisions or conditions hereof,  must be in writing and shall be effective only
to the extent set forth in writing.

     (b)  NOTICES.  All  notices,  requests  and  demands  required  under  this
Agreement must be in writing,  addressed to the applicable  party at its address
specified  below or to such other  address as any party may designate by written
notice to each  other  party,  and shall be deemed to have been given or made as
follows: (i) if personally delivered,  upon delivery; (ii) if sent by mail, upon
the  earlier of the date of receipt  or 3 days after  deposit in the U.S.  mail,
first class and postage prepaid; and (iii) if sent by telecopy, upon receipt.

     (c)  COSTS,  EXPENSES  AND  ATTORNEYS'  FEES.  Borrower  shall  pay to Bank
immediately  upon demand the full  amount of all  payments,  advances,  charges,
costs and expenses,  including  reasonable  attorneys'  fees (to include outside
counsel fees and all allocated  costs of Bank's in-house  counsel),  expended or
incurred by Bank in connection  with (i) the negotiation and preparation of this
Agreement and the other Loan Documents,  and Bank's continued  administration of
each Credit,  Iii) the enforcement of Bank's rights and/or the collection of any
amounts which become due to Bank under any of the Loan Documents,  and (iii) the
prosecution  or  defense  of any  action in any way  related  to any of the Loan
Documents,  including  without  limitation,  any action for declaratory  relief,
whether incurred at the trial or appellate  level, in an arbitration  proceeding
of otherwise, and including any of the foregoing incurred in connection with any
bankruptcy proceeding  (including without limitation,  any adversary proceeding,
contested  matter or motion brought by Bank or any other person) relating to any
Borrower or any other person or entity.

     (d) SUCCESSORS;  ASSIGNMENT. This Agreement shall be binding upon and inure
to the benefit of the heirs, executors,  administrators,  legal representatives,
successors and assigns of the parties;  provided however,  that Borrower may not
assign or transfer  its  interests  or rights.  hereunder  without  Bank's prior
written consent. Bank reserves the right to sell, assign, transfer, negotiate or
grant  participations  in all or any part of, or any interest in,  Bank's rights
and benefits under each of the Loan Documents.  In connection therewith Bank may
disclose  all  documents  and  information  which Bank now has or may  hereafter
acquire relating to any Credit,  Borrower or its business,  any guarantor of any
Credit or the business of any such guarantor, or any collateral for any Credit.

     (e) CONTROLLING AGREEMENT;  Amendment.  In the event of any direct conflict
between any  provision  of this  Agreement  and any  provision of any other Loan
Document,  the terms of this  Agreement  shall  control.  This  Agreement may be
amended or modified only in writing signed by Bank and Borrower.

                                       7

     (f) NO THIRD PARTY  BENEFICIARIES.  This Agreement is made and entered into
for the sole  protection and benefit of the parties hereto and their  respective
permitted successors and assigns, and no other person or entity shall be a third
party beneficiary of, or have any direct or indirect cause of action or claim in
connection with, this Agreement or any other Loan Document to which it is riot a
party.

     (g) SEVERABILITY OF PROVISIONS. If any provision of this Agreement shall be
held to be prohibited by or invalid under  applicable  law, such provision shall
be ineffective  only to the extent of such  prohibition  of invalidity,  without
invalidating the remainder of such provision or any remaining provisions of this
Agreement.

     (h)  GOVERNING  LAW. This  Agreement  shall be governed by and construed in
accordance with the laws of the state of Arizona.

         (i) CANCELLATION OF PRIOR LOAN AGREEMENTS.  This Agreement  cancels and
supersedes all prior loan agreements  between  Borrower and Bank relating to any
Credit.

     VI. ARBITRATION.

     (a)  ARBITRATION.  Upon the  demand  of any  party,  any  Dispute  shall be
resolved by binding arbitration (except as set forth in (a) below) in accordance
with the terms of this Agreement.  A "Dispute"  shall mean any action,  dispute,
claim or  controversy  of any kind,  whether in contract or tort,  statutory  or
common law,  legal or equitable,  now existing or hereafter  arising under or in
connection with, or in any way pertaining to, any of the Loan Documents,  or any
past, present or future extensions of credit and other activities,  transactions
or  obligations  of any kind related  directly or  indirectly to any of the Loan
Documents,  including  without  limitation,  any of  the  foregoing  arising  in
connection  with the  exercise of any  self-help,  ancillary  or other  remedies
pursuant  to any of the Loan  Documents.  Any party may by  summary  proceedings
bring an action in court to compel arbitration of a Dispute. Any party who fails
or refuses to submit to arbitration following a lawful demand by any other party
shall bear all costs and  expenses  incurred by such other  party in  compelling
arbitration of any Dispute.

     (b) GOVERNING RULES.  Arbitration  proceedings shall be administered by the
American  Arbitration  Association  ("AAA") or such other  administrator  as the
parties  shall  mutually  agree  upon in  accordance  with  the  AAA  Commercial
Arbitration  Rules. All Disputes  submitted to arbitration  shall be resolved in
accordance with the Federal Arbitration Act (Title 9 of the United States Code),
notwithstanding  any  conflicting  choice  of law  provision  in any of the Loan
Documents.  The arbitration shall be conducted at a location in Arizona selected
by the AAA or other  administrator.  If there is any  inconsistency  between the
terms hereof and any such rules, the terms and procedures set forth herein shall
control. All statutes of limitation applicable to any Dispute shall apply to any
arbitration  proceeding.  All discovery activities shall be expressly limited to
matters  directly  relevant to the Dispute being  arbitrated.  Judgment upon any
award  rendered  in  an   arbitration   may  be  entered  in  any  court  having
jurisdiction; provided however, that nothing contained herein shall be deemed to
be a waiver by any party that is a bank of the protections  afforded to it under
12 U.S.C. ss.91 or any similar applicable state law.

     (c)  NO  WAIVER;  PROVISIONAL  REMEDIES,   SELF-HELP  AND  FORECLOSURE.  No
provision  hereof  shall  limit  the right of any  party to  exercise  self-help
remedies  such as setoff,  foreclosure  against or sale of any real or  personal
property collateral or security, or to obtain provisional or ancillary remedies,
including  without  limitation  injunctive  relief,  sequestration,  attachment,
garnishment  or the  appointment  of a  receiver,  from  a  court  of  competent
jurisdiction  before,  after or during the pendency of any  arbitration or other
proceeding.  The  exercise of any such  remedy  shall not waive the right of any
party to compel arbitration hereunder.

     (d)  ARBITRATOR  QUALIFICATIONS  AND POWERS;  AWARDS.  Arbitrators  must be
active  members  of the  Arizona  State  Bar or  retired  judges of the state or
federal  judiciary of Arizona,  with expertise in the substantive law applicable
to the subject  matter of the  Dispute.  Arbitrators  are  empowered  to resolve
Disputes  by summary  rulings in  response  to motions  filed prior to the final
arbitration  hearing.  Arbitrators  (i) shall resolve all Disputes in accordance
with the substantive  law of the state of Arizona,  (ii) may grant any remedy or
relief  that a court of the state of  Arizona  could  order or grant  within the
scope hereof and such  ancillary  relief as is necessary to make  effective  any
award,  and (iii) shall have the power to award  recovery of all costs and fees,
to impose sanctions and to take such other actions as they deem necessary to the
same extent a judge could pursuant to the Federal Rules of Civil Procedure,  the
Arizona Rules of Civil  Procedure or other  applicable law. Any Dispute in which
the amount in  controversy  is  $5,000,000  or less shall be decided by a single
arbitrator who shall not render an award of greater than  $5,000,000  (including
damages, costs, fees and expenses).  By submission to a single arbitrator,  each
party expressly waives any right or claim to recover more than  $5,000,000.  Any
Dispute in which the amount in controversy  exceeds  $5,000,000 shall be decided
by majority vote of a panel of three  arbitrators;  provided  however,  that all
three arbitrators must actively participate in all hearings and deliberations.

                                       8

     (e) JUDICIAL REVIEW.  Notwithstanding  anything herein to the contrary,  in
any  arbitration in which the amount in  controversy  exceeds  $25,000,000,  the
arbitrators  shall be required to make  specific,  written  findings of fact and
conclusions of law. In such  arbitrations (i) the arbitrators shall not have the
power to make any award which is not supported by substantial  evidence or which
is based on legal  error,  (ii) an award  shall not be binding  upon the parties
unless the  findings  of fact are  supported  by  substantial  evidence  and the
conclusions of law are not erroneous  under the  substantive law of the state of
Arizona, and (iii) the parties shall have in addition to the grounds referred to
in the Federal  Arbitration  Act for vacating,  modifying or correcting an award
the right to judicial review of (A) whether the findings of fact rendered by the
arbitrators  are  supported  by  substantial  evidence,   and  (B)  whether  the
conclusions  of law are  erroneous  under  the  substantive  law of the state of
Arizona.  Judgment  confirming an award in such a proceeding may be entered only
if a court  determines  the award is supported by  substantial  evidence and not
based on legal error under the substantive law of the state of Arizona.

     (f)  MISCELLANEOUS.  To  the  maximum  extent  practicable,  the  AAA,  the
arbitrators  and the parties  shall take all action  required  to  conclude  any
arbitration  proceeding  within 180 days of the filing of the  Dispute  with the
AAA. No arbitrator or other party to an arbitration  proceeding may disclose the
existence,  content or results thereof, except for disclosures of information by
a party  required in the ordinary  course of its business,  by applicable law or
regulation,  or to the extent  necessary to exercise any judicial  review rights
set forth herein.  If more than one agreement for  arbitration by or between the
parties  potentially  applies  to a  Dispute,  the  arbitration  provision  most
directly  related to the Loan  Documents  or the  Subject  matter of the Dispute
shall control. This arbitration  provision shall survive termination,  amendment
or  expiration  of any of the Loan  Documents  or any  relationship  between the
parties.

     IN WITNESS  WHEREOF,  Borrower and Bank have executed this  Agreement as of
JULY 14, 1998.

KNIGHT TRANSPORTATION, INC.                    WELLS FARGO BANK,
                                               NATIONAL ASSOCIATION
By: /s/ Clark Jenkins
    ------------------------------------       By: /s/
    CLARK JENKINS                                 ------------------------------
    CHIEF FINANCIAL OFFICER/SECRETARY          Title:
                                                      --------------------------
Address: 5601 W. BUCKEYE ROAD                  Address: 100 West Washington
         PHOENIX AZ 85043                               Phoenix, AZ 85003

                                       9

WELLS FARGO BANK                                       CERTIFICATE OF INCUMBENCY

TO: WELLS FARGO BANK, NATIONAL ASSOCIATION

     The undersigned, CLARK JENKINS, Secretary of KNIGHT TRANSPORTATION, INC., a
corporation created and existing under the laws of the state of ARIZONA,  hereby
certifies  to Wells  Fargo  Bank,  National  Association  ("Bank")  that (a) the
following  named  persons  are duly  elected  officers of this  corporation  and
presently hold the titles  specified  below, (b) said officers are authorized to
act on  behalf  of this  Corporation  in  transactions  with  Bank,  and (c) the
signature opposite each officer's name is his or her true signature:

Title                         Name                     Signature
- -----                         ----                     ---------
Chairman                      Randy Knight             /s/ Randy Knight
Chief Executive Officer       Kevin P. Knight          /s/ Kevin P. Knight
President                     Gary Knight              /s/ Gary Knight
Chief Financial Officer       Clark Jenkins            /s/ Clark Jenkins

The  undersigned  further  certifies  that  if any of the  above-named  officers
change, or this corporation shall immediately  provide to Bank a new Certificate
of  Incumbency.  Bank is  hereby  authorized  to rely  on  this  Certificate  of
Incumbency  until a new Certificate of Incumbency  certified by the Secretary of
this corporation is received by Bank.

IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed the corporate seal
of said corporation as of Knight Transportation, Inc.

                                             /s/ Clark Jenkins
                                             -----------------------------------
                                             CLARK JENKINS, Secretary

(SEAL)

                                       10

To:      Wells Fargo Bank,
         National Association
         100 West Washington
         Phoenix, AZ 85003


                           Re: KNIGHT TRANSPORTATION, INC. ("Borrower")


Attn:____________________________________________


     The  undersigned  is the Chief  Financial  Officer*  of  Borrower.  In said
capacity,  the  undersigned  hereby  certifies  to Wells  Fargo  Bank,  National
Association  ("Bank") that (a) the financial  statement of Borrower  dated as of
3/31/98,  heretofore or concurrently herewith delivered by Borrower to Bank, and
all  schedules  and  footnotes  thereto,  are true and  correct,  and have  been
prepared in accordance with generally accepted accounting principles, and (b) as
of the date hereof,  there exists no default or defined  Event of Default  under
any loan agreement, promissory note or any other document in effect with respect
to any credit accommodation granted by Bank to Borrower.

Dated:   7/14/98                       KNIGHT TRANSPORTATION, INC.

                                       By: /s/ Clark Jenkins
                                           -------------------------------------
                                       Title: Chief Financial Officer


* Insert the title of the signer who must be an officer of  Borrower  authorized
to borrow under the most current  Corporate  Borrowing  Resolution  delivered by
Borrower to Bank.


                                       11

WELLS FARGO BANK                                 CORPORATE RESOLUTION: BORROWING

TO: WELLS FARGO BANK, NATIONAL ASSOCIATION

     RESOLVED: That this corporation,  KNIGHT TRANSPORTATION,  INC., proposes to
obtain credit from time to time, or has obtained credit,  from Wells Fargo Bank,
National Association ("Bank").

     BE IT FURTHER RESOLVED, that any ONE of the following officers:

     CHAIRMAN OR CHIEF EXECUTIVE OFFICER OR CHIEF FINANCIAL OFFICER/SECRETARY OR
PRESIDENT

     together with any ONE of the following officers:

     NONE

of this  corporation be and they are hereby  authorized and empowered for and on
behalf of and in the name of this corporation and as its corporate act and deed:

     (a) To borrow  money from Bank and to assume any  liabilities  of any other
person or entity to Bank, in such form and on such terms and conditions as shall
be agreed upon by those  authorized  above and Bank,  and to sign and deliver to
Bank such  promissory  notes  and  other  evidences  of  indebtedness  for money
borrowed or advanced and/or for indebtedness assumed as Bank shall require; such
promissory notes or other evidences of indebtedness may provide that advances be
requested by telephone  communication  and by any officer,  employee or agent of
this  corporation so long as the advances are deposited into any deposit account
of this corporation  with Bank; this corporation  shall be bound to Bank by, and
Bank  may  rely   upon,   any   communication   or  act,   including   telephone
communications,  purporting to be done by any officer, employee of agent of this
corporation provided that Bank believes, in good faith, that the same is done by
such person.

     (b) To contract for the issuance by Bank of letters of credit,  to discount
with Bank notes,  acceptances  and evidences of  indebtedness  payable to or due
this corporation, to endorse the same and execute such contracts and instruments
for repayment  thereof to Bank as Bank shall require,  and to enter into foreign
exchange transactions with or through Bank.

     (c) To  mortgage,  encumber,  pledge,  convey,  grant,  assign or otherwise
transfer all or any part of this corporation's real or personal property for the
purpose of  securing  the  payment of any of the  promissory  notes,  contracts,
instruments  and other  evidences  of  indebtedness  authorized  hereby,  and to
execute and deliver to Bank such deeds of trust,  mortgages,  pledge agreements,
security agreements and/or other related documents as Bank shall require.

     (d) To perform all acts and to execute and deliver all documents  described
above and all other  contracts  and  instruments  which Bank deems  necessary or
convenient to accomplish  the purposes of this  resolution  and/or to perfect or
continue  the  rights,  remedies  and  security  interests  to be  given to Bank
pursuant hereto,  including  without  limitation,  any  modifications,  renewals
and/or  extensions of any of this  corporation's  obligations  to Bank,  however
evidenced; provided that the aggregate principal amount of all sums borrowed and
credits established pursuant to this resolution shall not at any time exceed the
sum of $10,100,000.00 outstanding and unpaid.

     Loans made  pursuant to a special  resolution  and loans made by offices of
Bank other than the office to which this  resolution  is  delivered  shall be in
addition to foregoing limitation.

     BE IT FURTHER RESOLVED,  that the authority hereby conferred is in addition
to that conferred by any other resolution  heretofore or hereafter  delivered by
this  corporation to Bank and shall continue in full force and effect until Bank
shall have  received  notice in  writing,  certified  by the  Secretary  of this

                                       12

corporation,  of the revocation hereof by a resolution duly adopted by the Board
of Directors of this corporation. Any such revocation shall be effective only as
to credit which is extended or committed by Bank,  or actions which are taken by
this corporation  pursuant to the resolutions  contained  herein,  subsequent to
Bank's receipt of such notice.  The authority  hereby  conferred shall be deemed
retroactive,  and any and all acts authorized  herein which were performed prior
to the passage of this resolution are hereby approved and ratified.

                                  CERTIFICATION

     I, CLARK JENKINS,  Secretary of KNIGHT TRANSPORTATION,  INC., a corporation
created and existing  under the laws of the state of ARIZONA,  do hereby certify
and  declare  that  the  foregoing  is a  full,  true  and  correct  copy of the
resolutions  duly  passed  and  adopted  by  the  Board  of  Directors  of  said
corporation,  by written  consent of all Directors of said  corporation  or at a
meeting of said Board duly and  regularly  called,  noticed  and held on May 13,
1998,  at which meeting a quorum of the Board of Directors was present and voted
in favor of said  resolutions;  that said  resolutions are now in full force and
effect; that there is no provision in the Articles of Incorporation or Bylaws of
said corporation, or any shareholder agreement,  limiting the power of the Board
of Directors of said corporation to pass the foregoing resolutions and that such
resolutions   are  in  conformity  with  the  provisions  of  such  Articles  of
Incorporation and Bylaws; and that no approval by the shareholders of, or of the
Outstanding  shares of, said corporation is required with respect to the matters
which are the subject of the foregoing resolutions.

     IN WITNESS  WHEREOF,  I have  hereunto set my hand and, if required by Bank
affixed the corporate seal of said corporation, as of 7/14/98.

                                       By: /s/ Clark Jenkins
                                           -------------------------------------
                                           CLARK JENKINS, Secretary

(SEAL)

                                       13

WELLS FARGO BANK                                                  LOAN AGREEMENT

     This Loan Agreement (this "Agreement" is entered into by and between KNIGHT
TRANSPORTATION,  INC.  ("Borrower") and WELLS FARGO BANK,  NATIONAL  ASSOCIATION
("Bank") and sets forth the terms and  conditions  which  govern all  Borrower's
commercial credit  accommodations  from Bank,  whether now existing or hereafter
granted  (each,  a  "Credit"  and  collectively,  'Credits"),  which  terms  and
conditions are in addition to those set forth in any other contract,  instrument
or document (collectively with this Agreement, the "Loan Documents") required by
this  Agreement  or  heretofore  or at any time  hereafter  delivered to Bank in
connection with any Credit.

     I.   REPRESENTATIONS   AND   WARRANTIES.   Borrower   makes  the  following
representations  and warranties to Bank,  which  representations  and warranties
shall be true as of the date hereof and on the date of each  extension of credit
under each Credit with the same effect as though made on each such date:

     (a) LEGAL STATUS.  Borrower is a  CORPORATION,  duly organized and existing
and in good standing under the laws of the State of ARIZONA, and is qualified or
licensed to do  business in all  jurisdictions  in which such  qualification  or
licensing is required or in which the failure to be qualified or licensed  could
have a material adverse effect on Borrower.

     (b)  AUTHORIZATION  AND VALIDITY.  Each of the Loan Documents has been duly
authorized, and upon its execution and delivery to Bank will constitute a legal,
valid and binding  obligation of Borrower or the party which  executes the same,
enforceable in accordance with its respective terms.

     (c) NO VIOLATION.  The execution,  delivery and  performance by Borrower of
each of the Loan Documents do not violate any provision of law or regulation, or
contravene any provision of Borrower's  Articles of Incorporation or By-Laws, or
result in any  breach of or  default  under any  agreement,  indenture  or other
instrument to which Borrower is a party or by which Borrower may be bound.

     (d) NO  LITIGATION.  There  are no  pending,  or to the best of  Borrower's
knowledge threatened,  actions, claims, investigations,  suits or proceedings by
or before any governmental authority, arbitrator, court or administrative agency
which  could  have a  material  adverse  effect on the  financial  condition  or
operation of Borrower  except as disclosed by Borrower to Bank in writing  prior
to the date hereof.

     (e) FINANCIAL  STATEMENTS.  The most recent annual  financial  statement of
Borrower,  and all interim financial statements delivered to Bank since the date
of said annual financial statement,  true copies of which have been delivered by
Borrower to Bank prior to the date hereof,  are  complete  and correct,  present
fairly the  financial  condition of Borrower and  disclose  all  liabilities  of
Borrower,   and  have  been  prepared  in  accordance  with  generally  accepted
accounting  principles.  Since the dates of such financial  statements there has
been no material adverse change in the financial condition of Borrower,  nor has
Borrower  mortgaged,  pledged,  granted  a  security  interest  in or  otherwise
encumbered  any of its  assets  or  properties  except  in  favor  of Bank or as
otherwise permitted by Bank in writing.

     (f) TAX RETURNS.  Borrower has no knowledge of any pending  assessments  or
adjustments  of its  income  tax  payable  with  respect  to any year  except as
disclosed by Borrower to Bank in writing prior to the date hereof.

     II. ADDITIONAL TERMS.

     (a)  CONDITIONS  PRECEDENT.  The  obligation of Bank to grant any Credit is
subject  to  the  condition   that  Bank  shall  have  received  all  contracts,
instruments and documents,  duly executed where applicable,  deemed necessary by
Bank to evidence such Credit and all terms and  conditions  applicable  thereto,
all of which shall be in form and substance satisfactory to Bank.

     (b)  APPLICATION  OF  PAYMENTS.  Each  payment made on each Credit shall be
applied first, to any interest then due,  second,  to any fees and charges then.
due, and third, to the outstanding principal balance thereof.

     III.  COVENANTS.  So long as any Credit  remains  available  or any amounts
under any Credit  remain  outstanding,  Borrower  shall,  unless Bank  otherwise
consents in writing:

     (a)  INSURANCE.  Maintain  and keep in force,  for each  business  in which
Borrower is engaged,  insurance of the types and in amounts  customarily carried
in similar  lines of  business,  including  but not  limited  to fire,  extended
coverage, public liability,  property damage and workers' compensation,  carried
with  companies and in amounts  satisfactory  to Bank,  and deliver to Bank from
time to time at Bank's  request  schedules  setting forth all insurance  then in
effect.

                                       14

     (b) COMPLIANCE: LAWS AND REGULATIONS; YEAR 2000.

         (i)  Preserve  and  maintain  all   licenses,   permits,   governmental
approvals,  rights,  privileges  and  franchises  necessary  for the  conduct of
Borrower's business; and comply with the provisions of all documents pursuant to
which Borrower is organized and/or which govern Borrower's  continued  existence
and with the  requirements  of all laws,  rules,  regulations  and orders of any
governmental authority applicable to Borrower and/or its business, and all state
or federal  environmental,  hazardous waste, health and safety statutes, and any
rules or  regulations  adopted  pursuant  thereto,  which  govern or affect  any
operations and/or properties of Borrower.

         (ii) Perform all acts reasonably  necessary to ensure that (A) Borrower
and any business in which  Borrower  holds a substantial  interest,  and (B) all
customers,  suppliers  and vendors  that are  material to  Borrower's  business,
become Year 2000 Compliant in a timely manner. Such acts shall include,  without
limitation,   performing  a  comprehensive  review  and  assessment  of  all  of
Borrower's  systems and adopting a detailed plan, with itemized budget,  for the
remediation,  monitoring and testing of such systems. As used herein, "Year 2000
Compliant"  shall mean, in regard to any entity,  that all  software,  hardware,
firmware,  equipment,  goods or systems  utilized by or material to the business
operations or financial  condition of such entity,  will  properly  perform date
sensitive  functions  before,  during and after the year 2000.  Borrower  shall,
immediately upon request,  provide to Bank such certifications or other evidence
of  Borrower's  compliance  with the terms  hereof as Bank may from time to time
require.

     (c) OTHER  INDEBTEDNESS.  Not create,  incur, assume or permit to exist any
indebtedness  or other  liabilities,  whether  secured or unsecured,  matured or
unmatured,  liquidated or unliquidated,  joint or several,  direct or contingent
(including any contingent liability under any guaranty of the obligations of any
person or entity),  except (i) the  liabilities of Borrower to Bank,  (ii) trade
debt incurred by Borrower in the normal  course of its  business,  and (iii) any
other  liabilities of Borrower  existing as of, and disclosed to Bank in writing
prior to, the date hereof.

     (d)  MERGER;   CONSOLIDATION;   TRANSFER  OF  ASSETS.  Not  merge  into  or
consolidate with any other entity; nor make any substantial change in the nature
of  Borrower's  business as conducted as of the date hereof;  nor acquire all or
substantially all of the assets of any other person or entity;  nor sell, lease,
transfer or otherwise  dispose of all or a  substantial  or material  portion of
Borrower's assets except in the ordinary course of its business.

     (e)  PLEDGE OF ASSETS.  Not  mortgage,  pledge,  grant or permit to exist a
security  interest in, or lien upon, all or any portion of Borrower's assets now
owned or  hereafter  acquired,  except  in favor of Bank and  except  any of the
foregoing  existing as of, and  disclosed to Bank in writing  prior to, the date
hereof.

     (f) FINANCIAL STATEMENTS. Provide to Bank all of the following, in form and
detail  satisfactory  to Bank,  together  with such current  financial and other
information as Bank from time to time may reasonably request:

         (i) As soon as available, but in no event later than 120 days after and
as of the end of each FISCAL year, AN AUDITED  financial  statement of Borrower,
prepared by an independent  certified public  accountant  acceptable to Bank, to
include a balance sheet,  income statement and statement of cash flow,  together
with all supporting schedules and footnotes.

         (ii) As soon as available, but in no event later than 60 days after and
as of the end of  EACH  FISCAL  QUARTER,  a  financial  statement  of  Borrower,
prepared  by  Borrower  and  certified  as correct  by an  officer  of  Borrower
authorized  to borrow  under the most  current  Corporate  Borrowing  Resolution
delivered by Borrower to Bank, to include a balance sheet and income  statement,
together with all supporting schedules and footnotes.

     *(g)  FINANCIAL  CONDITION.  Maintain  Borrower's  financial  condition  as
follows using generally accepted accounting principles  consistently applied and
used  consistently  with prior  practices,  except to the extent modified by the
following definitions:

         (i) Current Ratio not at any time less than 1.00 to 1 .0, with "Current
Ratio" defined as total current assets divided by total current liabilities.

         (ii) Tangible Net Worth not at any time less than $50,000,000.00,  with
"Tangible Net Worth" defined as the aggregate of total stockholders' equity plus
subordinated debt less any intangible assets.

         (iii) Total  Liabilities  divided by Tangible Net Worth not at any time
greater than 1.00 to 1.0, with "Total  Liabilities"  defined as the aggregate of
current liabilities and non-current liabilities less subordinated debt, and with
"Tangible Net Worth" as defined above.

         (iv) EBITDA  Coverage Ratio not less than 3.00 to 1.0 as of each FISCAL
quarter  end,  with  "EBITDA"  defined  as net profit  before tax plus  interest
expense  (net  of  capitalized  interest  expense),   depreciation  expense  and
amortization expense, and with "EBITDA Coverage Ratio" defined as EBITDA divided
by the aggregate of interest  expense plus the prior period current  maturity of
long-term debt and the prior period current maturity of subordinated debt.*

*To be measured on a rolling four quarter basis.

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     IV. DEFAULT; REMEDIES.

     (a)  EVENTS  OF  DEFAULT.  The  occurrence  of any of the  following  shall
constitute an "Event of Default" under this Agreement:

         (i) The failure to pay any principal,  interest,  fees or other charges
when due under any of the Loan Documents.

         (ii) Any  representation or warranty  hereunder or under any other Loan
Document  shall  prove to be  incorrect,  false or  misleading  in any  material
respect when made.

         (iii)  Any  violation  or  breach  of any  term  or  condition  of this
Agreement or any other of the Loan Documents.

         (iv) Any default in the payment or  performance of any  obligation,  or
any defined event of default,  under any provisions of any contract,  instrument
or document  pursuant to which Borrower or any guarantor  hereunder has incurred
debt or any other liability of any kind to any person or entity, including Bank.

         (v) The filing of a petition by or against  Borrower  or any  guarantor
hereunder  under any  provisions of the  Bankruptcy  Reform Act, Title 11 of the
United  States Code,  as amended or  recodified  from time to time, or under any
similar or other law relating to bankruptcy, insolvency, reorganization or other
relief for  debtors;  the  appointment  of a  receiver,  trustee,  custodian  or
liquidator  of or for any part of the assets or property of Borrower or any such
guarantor;  Borrower or any such guarantor  becomes  insolvent,  makes a general
assignment  for the benefit of creditors or is generally not paying its debts as
they become due; or any  attachment  or like levy on any property of Borrower or
any such guarantor.

         (vi) Any material adverse change,  as determined solely by Bank, in the
financial condition of Borrower.

         (vii) The death or incapacity of any individual guarantor hereunder; or
the  dissolution or liquidation of Borrower or of any guarantor  hereunder which
is a corporation, partnership or other type of entity.

         (viii) Any change in  ownership  during the term hereof of an aggregate
of 25% or more of the common stock of Borrower.

     (b) REMEDIES.  Upon the occurrence of any Event of Default:  (i) the entire
balance of principal, interest, fees and charges on each Credit shall, at Bank's
option, become immediately due and payable in full without presentment,  demand,
protest or notice of dishonor,  all of which are  expressly  waived by Borrower;
(ii) the  obligation,  if any, of Bank to extend any further  credit to Borrower
under any Credit shall  immediately  cease and  terminate;  and (iii) Bank shall
have all rights, powers and remedies available under each of the Loan Documents,
or  accorded by law,  including  without  limitation  the right to resort to any
security  for any  Credit.  All  rights,  powers and  remedies  of Bank shall be
cumulative.

     V. MISCELLANEOUS.

     (a) NO WAIVER.  No delay,  failure or  discontinuance of Bank in exercising
any  right,  power or remedy  under any of the Loan  Documents  shall  affect or
operate  as a waiver of such  right,  power or  remedy;  nor shall any single or
partial exercise of any such right, power or remedy preclude, waive or otherwise
affect any other or further exercise thereof or the exercise of any other right,
power or remedy. Any waiver,  permit, consent or approval of any kind by Bank of
any  breach  of or  default  under  this  Agreement,  or any such  waiver of any
provisions or conditions hereof,  must be in writing and shall be effective only
to the extent set forth in writing.

     (b)  NOTICES.  All  notices,  requests  and  demands  required  under  this
Agreement must be in writing,  addressed to the applicable  party at its address
specified  below or to such other  address as any party may designate by written
notice to each  other  party,  and shall be deemed to have been given or made as
follows: (i) if personally delivered,  upon delivery; (ii) if sent by mail, upon
the  earlier of the date of receipt  or 3 days after  deposit in the U.S.  mail,
first class and postage prepaid; and (iii) if sent by telecopy, upon receipt.

     (c)  COSTS,  EXPENSES  AND  ATTORNEYS'  FEES.  Borrower  shall  pay to Bank
immediately upon demand the full amount all payments,  advances,  charges, costs
and expenses,  including reasonable  attorneys' fees (to include outside counsel
fees and all allocated costs of Bank's in-house  counsel),  expended or incurred
by Bank in connection with (i) the negotiation and preparation of this Agreement
and the other  Loan  Documents,  and  Bank's  continued  administration  of each
Credit,  (ii) the  enforcement  of Bank's  rights  and/or the  collection of any
amounts which become due to Bank under any of the Loan Documents,  and (iii) the
prosecution  or  defense  of any  action in any way  related  to any of the Loan
Documents,  including  without  limitation,  any action for declaratory  relief,
whether incurred at the trial or appellate  level, in an arbitration  proceeding
or otherwise, and including any of the foregoing incurred in connection with any
bankruptcy proceeding  (including without limitation,  any adversary proceeding,
contested  matter or motion brought by Bank or any other person) relating to any
Borrower or any other person or entity.

     (d) SUCCESSORS;  ASSIGNMENT. This Agreement shall be binding upon and inure
to the benefit of the heirs, executors,  administrators,  legal representatives,
successors and assigns of the parties;  provided however,  that Borrower may not
assign or transfer  its  interests  or rights  hereunder  without  Bank's  prior
written consent. Bank reserves the right to sell, assign, transfer, negotiate or
grant  participations  in all or any part of, or any interest in,  Bank's rights
and benefits under each of the Loan Documents.  In connection therewith Bank may
disclose  all  documents  and  information  which Bank now has or may  hereafter
acquire relating to any Credit,  Borrower or its business,  any guarantor of any
Credit or the business of any such guarantor, or any collateral for any Credit.

                                       16

     (e) CONTROLLING AGREEMENT;  AMENDMENT.  In the event of any direct conflict
between any  provision  of this  Agreement  and any  provision of any other Loan
Document  the terms of this  Agreement  shall  control.  This  Agreement  may be
amended or modified only in writing signed by Bank and Borrower.

     (f) NO THIRD PARTY  BENEFICIARIES.  This Agreement is made and entered into
for the sole  protection and benefit of the parties hereto and their  respective
permitted successors and assigns, and no other person or entity shall be a third
party beneficiary of, or have any direct or indirect cause of action or claim in
connection  with, this Agreement or any other Loan Document to which it is not a
party.

     (g) SEVERABILITY OF PROVISIONS. If any provision of this Agreement snail be
held to be prohibited by or invalid under  applicable  law, such provision shall
be ineffective  only to the extent of such  prohibition  or invalidity,  without
invalidating the remainder of such provision or any remaining provisions of this
Agreement.

     (h)  GOVERNING  LAW. This  Agreement  shall be governed by and construed in
accordance with the laws of the state of Arizona.

     (i)  CANCELLATION  OF PRIOR LOAN  AGREEMENTS.  This  Agreement  cancels and
supersedes all prior loan agreements  between  Borrower and Bank relating to any
Credit.

     VI. ARBITRATION.

     (a)  ARBITRATION.  Upon the  demand  of any  party,  any  Dispute  shall be
resolved by binding arbitration (except as set forth in (a) below) in accordance
with the terms of this Agreement.  A "Dispute"  shall mean any action,  dispute,
claim or  controversy  of any kind,  whether in contract or tort,  statutory  or
common law,  legal or equitable,  now existing or hereafter  arising under or in
connection with, or in any way pertaining to, any of the Loan Documents,  or any
past, present or future extensions of credit and other activities,  transactions
or  obligations  of any kind related  directly or  indirectly to any of the Loan
Documents,  including  without  limitation,  any of  the  foregoing  arising  in
connection  with the  exercise of any  self-help,  ancillary  or other  remedies
pursuant  to any of the Loan  Documents.  Any party may by  summary  proceedings
bring an action in court to compel arbitration of a Dispute. Any party who fails
or refuses to submit to arbitration following a lawful demand by any other party
shall bear all costs and  expenses  incurred by such other  party in  compelling
arbitration of any Dispute.

     (b) GOVERNING RULES.  Arbitration  proceedings shall be administered by the
American  Arbitration  Association  ("AAA") or such other  administrator  as the
parties  shall  mutually  agree  upon in  accordance  with  the  AAA  Commercial
Arbitration  Rules. All Disputes  submitted to arbitration  shall be resolved in
accordance with the Federal Arbitration Act (Title 9 of the United States Code),
notwithstanding  any  conflicting  choice  of law  provision  in any of the Loan
Documents.  The arbitration shall be conducted at a location in Arizona selected
by the AAA or other  administrator.  If there is any  inconsistency  between the
terms hereof and any such rules, the terms and procedures set forth herein shall
control. All statutes of limitation applicable to any Dispute shall apply to any
arbitration  proceeding.  All discovery activities shall be expressly limited to
matters  directly  relevant to the Dispute being  arbitrated.  Judgment upon any
award  rendered  in  an   arbitration   may  be  entered  in  any  court  having
jurisdiction; provided however, that nothing contained herein shall be deemed to
be a waiver by any party that is a bank of the protections  afforded to it under
12 U.S.C. ss.91 or any similar applicable state law.

     (c)  NO  WAIVER;  PROVISIONAL  REMEDIES,   SELF-HELP  AND  FORECLOSURE.  No
provision  hereof  shall  limit  the right of any  party to  exercise  self-help
remedies  such as setoff,  foreclosure  against or sale of any real or  personal
property collateral or security, or to obtain provisional or ancillary remedies,
including  without  limitation  injunctive  relief,  sequestration,  attachment,
garnishment  or the  appointment  of a  receiver,  from  a  court  of  competent
jurisdiction  before,  after or during the pendency of any  arbitration or other
proceeding.  The  exercise of any such  remedy  shall not waive the right of any
party to compel arbitration hereunder.

     (d)  ARBITRATOR  QUALIFICATIONS  AND POWERS;  AWARDS.  Arbitrators  must be
active  members  of the  Arizona  State  Bar or  retired  judges of the state or
federal  judiciary of Arizona,  with expertise in the substantive law applicable
to the subject  matter of the  Dispute.  Arbitrators  are  empowered  to resolve
Disputes  by summary  rulings in  response  to motions  filed prior to the final
arbitration  hearing.  Arbitrators  (i) shall resolve all Disputes in accordance
with the substantive  law of the state of Arizona,  (ii) may grant any remedy or
relief  that a court of the state of  Arizona  could  order or grant  within the
scope hereof and such  ancillary  relief as is necessary to make  effective  any
award,  and (iii) shall have the power to award  recovery of all costs and fees,
to impose sanctions and to take such other actions as they deem necessary to the
same extent a judge could pursuant to the Federal Rules of Civil Procedure,  the
Arizona Rules of Civil  Procedure or other  applicable law. Any Dispute in which
the amount in  controversy  is  $5,000,000  or less shall be decided by a single
arbitrator who shall not render an award of greater than  $5,000,000  (including
damages, costs, fees and expenses).  By submission to a single arbitrator,  each
party expressly waives any right or claim to recover more than  $5,000,000.  Any
Dispute in which the amount in controversy  exceeds  $5,000,000 shall be decided
by majority vote of a panel of three  arbitrators;  provided  however,  that all
three arbitrators must actively participate in all hearings and deliberations.

     (e) JUDICIAL REVIEW.  Notwithstanding  anything herein to the contrary,  in
any  arbitration in which the amount in  controversy  exceeds  $25,000,000,  the
arbitrators  shall be required to make  specific,  written  findings of fact and
conclusions of law. In such  arbitrations (i) the arbitrators shall not have the
power to make any award which is not supported by substantial  evidence or which
is based on legal  error,  (ii) an award  shall not be binding  upon the parties
unless the  findings  of fact are  supported  by  substantial  evidence  and the
conclusions of law are not erroneous  under the  substantive law of the state of

                                       17

Arizona, and (iii) the parties shall have in addition to the grounds referred to
in the Federal Arbitration Act for vacating, reducing or correcting an award the
right to judicial  review of (A) whether  the  findings of fact  rendered by the
arbitrators  are  supported  by  substantial  evidence,   and  (B)  whether  the
conclusions  of law are  erroneous  under  the  substantive  law of the state of
Arizona.  Judgment  confirming an award in such a proceeding may be entered only
if a court  determines  the award is supported by  substantial  evidence and not
based on legal error under the substantive law of the state of Arizona.

     (f)  Miscellaneous.  To  the  maximum  extent  practicable,  the  AAA,  the
arbitrators  and the parties  shall take all action  required  to  conclude  any
arbitration  proceeding  within 180 days of the filing of the  Dispute  with the
AAA. No arbitrator or other party to an arbitration  proceeding may disclose the
existence,  content or results thereof, except for disclosures of information by
a party  required in the ordinary  course of its business,  by applicable law or
regulation,  or to the extent  necessary to exercise any judicial  review rights
set forth herein.  If more then one agreement for  arbitration by or between the
parties  potentially  applies  to a  Dispute,  the  arbitration  provision  most
directly  related to the Loan  Documents  or the  subject  matter of the Dispute
shall control. This arbitration  provision shall survive termination,  amendment
or  expiration  of any of the Loan  Documents  or any  relationship  between the
parties.

     IN WITNESS  WHEREOF,  Borrower and Bank have executed this  Agreement as of
OCTOBER 1, 1998.

KNIGHT TRANSPORTATION, INC.                      WELLS FARGO BANK,
                                                 NATIONAL ASSOCIATION

By: /s/ Clark Jenkins                            By: /s/
    ---------------------------------            -------------------------------
    CLARK JENKINS                                Title: Vice President
    CHIEF FINANCIAL OFFICER/SECRETARY

Address: 5601 W. BUCKEYE ROAD                    Address: 100 West Washington
         PHOENIX, AZ 85043                                Phoenix, AZ 85003


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