AMENDED ARTICLES OF INCORPORATION 
                                      OF
                   TRANSPORTATION INFORMATION SERVICES, INC.


STATE OF OKLAHOMA)
                 ) ss.
COUNTY OF TULSA  )

TO THE SECRETARY OF STATE OF THE STATE OF OKLAHOMA:

     Transportation Information Services, Inc., a Corporation organized and
existing under the laws of the State of Oklahoma, hereby certifies as follows:

     1.   The name of the Corporation is Transportation Information Services,
Inc. The date of filing its original Articles of Incorporation with the
Secretary of State of the State of Oklahoma was November 12, 1982.

     2.   These Amended Articles of Incorporation incorporate the amendments in
the original Articles of Incorporation made by a Plan and Agreement of Merger
dated the 25th day of February, 1983 and these Articles of Incorporation only
restate and integrate said amendments into the original Articles of
Incorporation and do not further amend the provisions of the Articles of
Incorporation of this Corporation as heretofore amended or supplemented and
there is no discrepancy between those provisions and the provisions of these
Amended Articles of Incorporation.

     3.   These Amended Articles of Incorporation were duly adopted by the
shareholders in accordance with Section 167(5) of the Oklahoma Business
Corporation Act, 18 O.S. 1981, (S 1.167(5)).

     4.   The text of the Articles of Incorporation as amended or supplemented
heretofore are hereby restated without further amendments or changes to read as
herein set forth in full.

                                   ARTICLE I
                                   ---------

    The name of the corporation is:
    -------------------------------

                   TRANSPORTATION INFORMATION SERVICES, INC.

                                  ARTICLE II
                                  ----------

     The address of its registered office in the State of Oklahoma is 2815 E.
Skelly Drive, Tulsa, Oklahoma 74105, and the name of its registered agent is
Charles R. Dees, at the same address.

 
                                  ARTICLE III
                                  -----------

The duration of the corporation is perpetual.

                                  ARTICLE IV
                                  ----------

     The purpose or purposes for which the corporation is formed and the
business objects to be carried on and promoted by it are as follows:

        To develop, operate and market systems to provide employment histories
        to employers; to sell and collect fees from member employers for use of
        the system(s); develop systems and programs for employment histories,
        employment studies and other computerized information and data
        processing services.

        To acquire, own, hold, exchange and dispose of any property, real,
        personal or mixed, being useful, necessary or convenient in connection
        with the purposes of this corporation, and to sell for cash, property
        and/or securities of any kind, or other things of value, any part or all
        of the property or assets of this corporation at any time acquired,
        owned or held by it, including the right to mortgage, pledge or
        otherwise encumber any part or all of the assets of this corporation to
        secure the payment of any of its obligations, but subject always to the
        laws of the State of Oklahoma.

        To enter into, make, perform, carry out and discharge contracts of any
        and every kind, for any lawful purposes, without limit as to amount,
        with any person, firm, association, partnership or corporation, either
        public or private, And to guarantee the performance by other persons
        or entities of contracts and other obligations of any and every kind.

        To subscribe for or cause to be subscribed for, buy, own, hold,
        purchase, receive and acquire, and to sell, negotiate, guarantee,
        assign, deal in, exchange, transfer, mortgage, pledge or otherwise
        dispose of shares of the capital stock, scrip, bonds, coupons,
        mortgages, debentures, debenture stocks, securities, notes, acceptances,
        drafts and evidences of indebtedness issued or created by other
        corporations, joint stock companies, partnerships or associations,
        whether public, private or municipal, or by any corporate body, and
        while the owner thereof, to possess and exercise in respect thereto all
        the rights, powers and privileges of ownership, including the right to
        vote; and to do any and all acts or things designed to protect,
        preserve, improve or enhance the value of any such shares, scrip, bonds,
        coupons, mortgages, debentures, debenture stocks, securities, notes,
        drafts, acceptances, bills of exchange or other evidences of
        indebtedness.

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        To buy, acquire in any manner, purchase, apply for or obtain any and all
        letters patent, licenses, patent rights, trademarks, copyrights,
        patented processes and similar rights granted by the United States or
        any other sovereign or government or any interest therein or any
        invention which may be capable of being used for or in connection with
        any of the objects or purposes of this corporation, and any and all
        franchises, and to use, exercise, develop, sell, lease, grant rights
        in, and dispose of or grant rights with respect to any and all such
        franchises, trademarks, patents and copyrights, and to carry on any
        business, manufacturing or otherwise, which may be deemed to aid,
        effectuate or develop, directly or indirectly, the general purposes of
        the corporation, or any of them.

        To issue shares of the capital stock of this corporation as authorized
        for cash, labor performed, property either real or personal, or leases
        thereof, or for any combination of the foregoing, or in exchange for the
        stocks, debentures (including convertible debentures), debenture stocks,
        bonds, securities, notes or obligations of any person, firm,
        association, partnership, corporation or other organization.

        To borrow money for any of the purposes of this corporation and to
        issue bonds, debentures (including convertible debentures), debenture
        stocks, notes and other obligations therefor, and to secure the same by
        pledge or mortgage of the whole or any part of the property of this
        corporation, either real or personal, whether at the time owned or
        thereafter acquired, and/or to issue bonds, debentures, debenture
        stocks, notes or other obligations without any such security.

        To have one or more offices to carry on any authorized operations and
        businesses, without restrictions or limits as to number, in any of the
        states or territories of the United States or in any and all foreign
        countries.

        To do any and all things hereinabove set forth and, in addition, such
        other acts and things as are necessary or convenient to the attainment
        of the purposes of this corporation, to the same extent as natural
        persons lawfully might or could do in any part of the world, insofar as
        such acts or things are permitted to be done by corporations organized
        under the general laws of the State of Oklahoma.

        It is the intention that the objects and purposes specified in the
foregoing clauses of this Article IV shall not, unless otherwise specified
herein, be limited or restricted by any other clause or paragraph hereof, but
that the objects and purposes specified in each of said clauses shall be
regarded as independent objects and purposes. It is also the intention that said
clauses be construed both as purposes and powers; and generally that the
corporation shall be authorized to exercise and enjoy all other powers, rights
and privileges granted to or conferred upon corporations of this

                                      -3-

 
kind by the laws of the State of Oklahoma, and the enumeration of certain powers
as herein specified is not intended as exclusive of or as a waiver of any of the
powers, rights or privileges granted or conferred by the laws of the State of
Oklahoma now or hereafter in force.

                                   ARTICLE V
                                   ---------

     The aggregate number of shares which the corporation shall have authority
to issue is Two Hundred Forty Thousand (240,000) shares of Common Stock of the
par value of Ten Cents ($.10) per share.

     There shall be no other class of stock of the corporation than the Common
Stock set out hereinabove.

                                  ARTICLE VI
                                  ----------

     The amount of the stated capital with which the corporation will begin
business is Five Hundred Dollars ($500.00), which has been fully paid in.

                                  ARTICLE VII
                                  -----------

     The number and class of shares to be issued by the corporation before it
shall begin business will be Five Thousand (5,000) shares of Common Stock of the
par value of Ten Cents ($.10) per share, for which the corporation will receive
a consideration of Five Hundred Dollars ($500.00) cash.

                                 ARTICLE VIII
                                 ------------

     The number of directors to be elected at the first meeting of the
stockholders is three (3), who shall be and constitute the Board of Directors of
the corporation and serve as such until their successors are duly elected and
qualify, as provided in the by-laws of the corporation to be hereafter adopted.
The Board of Directors to be elected for future terms of office shall consist of
not less than three (3) nor more than ten (10) members, as may be provided by
the by-laws of the corporation. The Board of Directors shall be vested with
power and authority to accept or reject subscriptions for shares of the
corporation on such terms and conditions as may seem appropriate, except as
otherwise provided by law. The Board of Directors shall have authority to adopt
by-laws of the corporation, subject to the power of the stockholders to alter or
repeal such bylaws; provided, however, that the Board of Directors shall not
adopt or alter any by-law fixing the number, qualifications, classifications or
terms of office of Directors. The enumeration in this Article of certain powers
and authority expressly conferred on the Board of Directors of this corporation
shall not be construed as a restriction

                                      -4-

 
on or limitation of other powers, and the Board of Directors of this corporation
shall exercise all power and authority authorized to be exercised by boards of
directors of corporations organized under the Business Corporation Act of the
State of Oklahoma, in the absence of any restriction or limitation thereon in
the Articles of Incorporation, and any additional powers and authority which may
be reasonably necessary or convenient in connection therewith, in addition to
the powers expressly enumerated herein.

                                  ARTICLE IX
                                  ----------

     The corporation may, to the fullest extent allowed by Oklahoma law, provide
for the indemnification of any person against expenses (including attorney's
fees), judgments, fines and amounts paid in settlement, incurred by him in any
threatened, pending or completed action, suit or proceeding (including appeals),
whether civil, criminal, administrative or investigative, if such action, suit
or proceeding arose by reason of the fact that he is or was a director, officer,
employee or agent of the corporation or, if he is or was serving at the request
of the corporation as a director, officer, employee or agent, of another
corporation, partnership, joint venture, trust or other enterprise. The
corporation may purchase and maintain insurance on behalf of any such person
against any liability asserted against him and incurred by him in any such
capacity, or arising out of his status as such, whether or not the corporation
would have the power to indemnify him against liability under the provisions
hereof.

                                   ARTICLE X
                                   ---------

     The private property of the stockholders shall not be subject to the
payment of corporate debts to any extent whatsoever.

                                  ARTICLE XI
                                  ----------

     All voting powers shall be vested in the holders of the common stock of the
corporation except as may be otherwise herein specifically provided, and any
holder of common shares shall be entitled at each meeting of the stockholders
thereof to one vote for each common share outstanding in the name of such
stockholder on the books of the corporation.

                                  ARTICLE XII
                                  -----------

     No right to dissent, as set out in the Business Corporation Act of the
State of Oklahoma or subsequent amendments and supplements thereto, shall exist
in behalf of any stockholders of this corporation as to any specified corporate
action or as to all corporate action, if such action be approved by the vote or
written

                                      -5-

 
consent of the holders of at least ninety per cent (90%) of all outstanding
shares of the corporation.

                                 ARTICLE XIII
                                 ------------

     The corporation reserves the right to amend, alter, change or repeal any
provisions contained in these Articles of Incorporation in the manner now or
hereafter prescribed by statute, and all rights conferred upon stockholders
herein are granted subject to this reservation.


     DATED at Tulsa, Oklahoma, this 25th day of February, 1983.

                                      TRANSPORTATION INFORMATION SERVICES, INC.

                                      By /s/ Charles R. Dees
                                         ------------------------------
                                           Charles R. Dees, President


[SEAL]

ATTEST:

    /s/ Doris Marie Lockwood
    -----------------------------
             Secretary

STATE OF OKLAHOMA )
                  )ss.
COUNTY OF TULSA   )

     Before me, the undersigned, a Notary Public in and for said County and
State, on this 25th day of February, 1983, personally appeared Charles R. Dees
to me known to be the identical person who subscribed the name of the maker
thereof to the foregoing instrument as its President, and acknowledged to me
that he executed the same as his free and voluntary act and deed and as the free
and voluntary act and deed of such corporation, for the uses and purposes 
therein set forth.

     Given under my hand and seal of office the day and year last above written.

                                    /s/ Barbara Bailey
                                    -----------------------
                                         Notary Public

My Commission Expires:

Jan. 5, 1986
- ------------

                                      -6-

 
                       OFFICE OF THE SECRETARY OF STATE
                               STATE OF OKLAHOMA

                                    MERGER
                         CERTIFICATE OF INCORPORATION

To all to Whom these Presents shall Come, Greetings:
        WHEREAS, Articles of Incorporation duly signed and verified of

                   TRANSPORTATION INFORMATION SERVICES, INC.
                 ---------------------------------------------

have been filed in the office of the Secretary of State as provided by the Laws 
of the State of Oklahoma.

        NOW THEREFORE, I, the undersigned, Secretary of State of the State of
Oklahoma by virtue of the powers vested in me by law, do hereby issue this
Certificate of Incorporation.

        IN TESTIMONY WHEREOF, I hereunto set my hand and cause to be affixed the
Great Seal of the State of Oklahoma.

                                Filed at the City of Oklahoma City, this 22nd
                                day of March, A.D. 1983
                                       -----         --

                                /s/ 
                                ______________________________
                                Secretary of State


                                By: /s/ 
                                    __________________________
[SEAL]
       

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