WELLS FARGO BANK                                                TERM NOTE

$10,000,000.00                                                  Phoenix, Arizona
                                                                October 1, 1993

     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 85003, or at such other place as the holder hereof may designate in
lawful money of the United States of America and n immediately  available funds,
the principal sum of $10,000,000,00, with interest thereon as set forth herein.

INTEREST/FEES:

     (a) INTEREST.  The  outstanding  principal  balance of this Note shall bear
interest at the rate of 5.75000%  per annum  (computed on the basis of a 360-day
year, actual days elapsed).

     (b) 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.

     (c)  COLLECTION  OF  PAYMENTS.  Borrower  authorizes  Bank to  collect  all
principal  and interest  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.

REPAYMENT AND PREPAYMENT:

     (a)  REPAYMENT.  Principal and interest  shall be payable on the 1ST day of
each MONTH in installments or $192,558.23 each, commencing NOVEMBER 1, 1998, and
continuing  up to and  including  SEPTEMBER  1, 2003,  with a final  installment
consisting  of all  remaining  unpaid  principal  and accrued  interest  due and
payable in full on OCTOBER 1, 2003.

     (b) PREPAYMENT.  Borrower may prepay  principal on this Note at any time in
the minimum amount of  $100,000.00;  provided  however,  that if the outstanding
principal balance of this Note is less than said amount,  the minimum prepayment
amount  shall  be  the  entire   outstanding   principal   balance  hereof.   In
consideration of Bank providing this prepayment  option to Borrower,  or if this
Note shall become due and payable at any time prior to the maturity  date hereof
by acceleration or otherwise, Borrower shall pay to Bank immediately upon demand
a fee which is the sum or the discounted monthly differences for each month from
the month of prepayment through the month in which this Note 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 scheduled maturity date hereof.

     (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 this Note at the Money Market Funds Rate 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 the Money Market Funds Rate 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).  The "Prime  Rate" is a base rate that Bank from time to
time  establishes  and which serves as the basis upon which  effective  rates of
interest are calculated for those loans making reference thereto. 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.

                                       1

     The "Money Market Funds Rate" means the rate per annum which Bank estimates
and quotes to its  borrowers  as the rate,  adjusted  for reserve  requirements,
federal deposit insurance and any other amount which Bank deems appropriate,  at
which funds in the amount of a loan and for a period of time  comparable  to the
term of such loan are  available  for  purchase in the money  market on the date
such loan is made with the  understanding  that the Money  Market  Funds Rate is
Bank's  estimate only and that Bank is under no obligation to actually  purchase
and/or match funds for any transaction.  This rate is not fixed by or related in
any way to any rate that Bank quotes or pays for deposits  accepted  through its
branch system.

     All prepayments of principal shall be applied on the most remote  principal
installment or installments then unpaid.

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,  if 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


                                       2

WELLS FARGO BANK                                              DISBURSEMENT ORDER

DATE:  OCTOBER 1, 1998

OFFICE: ARIZONA RCBO #03839, 100 WEST WASHINGTON, PHOENIX, AZ 85003

Wells Fargo Bank, National Association, is hereby authorized to pay the proceeds
of the credit  accommodation to the undersigned  granted in the principal amount
of $10,000,000.00 to the order of:

                           NAME                                  AMOUNT
                           ----                                  ------

                                                           $
- -------------------------------------------------------     -------------------
                                                           $
- -------------------------------------------------------     -------------------
                                                           $
- -------------------------------------------------------     -------------------
                                                           $
- -------------------------------------------------------     -------------------
                                                           $
- -------------------------------------------------------     -------------------
                                                           $
- -------------------------------------------------------     -------------------


KNIGHT TRANSPORTATION, INC.

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

                                       3

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,  CHIEF EXECUTIVE  OFFICER,  CHIEF FINANCIAL  OFFICER,  SECRETARY,
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 or 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 $20,100,000.00 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.

                                       4

     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
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 , 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


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

(SEAL)

                                       5

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
June 30, 1998,  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: Oct. 1, 1998                         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.

                                       6