Document:

<PAGE>

                      THIRD AMENDMENT TO CREDIT AGREEMENT
                      -----------------------------------

     THIS THIRD AMENDMENT TO CREDIT AGREEMENT, dated as of May 12, 2000 (this
"Amendment"), is among APCOA/STANDARD PARKING, INC., a Delaware corporation (the
"Company"), the Lenders set forth on the signature pages hereof (collectively,
the "Lenders") and BANK ONE, NA, as agent for the Lenders (in such capacity, the
"Agent").

                                   RECITALS
                                   --------

          A.   The Company, the Guarantors, the Agent and the Lenders are
parties to a Credit Agreement dated as of March 30, 1998 (as clarified by letter
agreement dated March 30, 1999, amended by a First Amendment to Credit Agreement
dated as of November 12, 1999, the "Credit Agreement") and further amended by a
Second Amendment to Credit Agreement dated as of March 30, 2000.

          B.   The Company desires to amend the Credit Agreement, and the Agent
and the Lenders are willing to do so in accordance with the terms hereof.

                                     TERMS
                                     -----

          In consideration of the premises and of the mutual agreements herein
contained, the parties agree as follows:

          ARTICLE I. AMENDMENTS. Upon fulfillment of the conditions set forth in
Article III hereof, the Credit Agreement shall be amended as follows:

          1.1  The definition of "Change of Control" in Section 1. 1 shall be
amended by adding after the words "free and clear of any Lien" in subclause (B)
of clause (vi) the words: "other than any Lien in favor of Christiania Bank og
Kreditkasse ASA, New York Branch or any successor thereto or assignee thereof".

          1.2  The following definitions are hereby added to Section 1.1 in
appropriate alphabetical order:

               "Third Amendment" shall mean the Third Amendment to this
Agreement dated as of May 12, 2000.

               "Third Amendment Effective Date" shall mean the date of the
Third Amendment.

          ARTICLE II. REPRESENTATIONS AND AGREEMENTS. The Company represents and
warrants to, and agrees with, the Agent and the Lenders that:

          2.1  The execution, delivery and performance of this Amendment are
within its powers, have been duly authorized and are not in contravention of any
statute, law or regulation known to it or of any terms of its Articles of
Incorporation or By-laws, or of any material agreement or undertaking to which
it is a party or by which it is bound.
<PAGE>

          2.2  This Amendment is the legal, valid and binding obligations of the
Company and each Guarantor enforceable against each in accordance with the
respective terms thereof.

          2.3  After giving effect to the amendments contained herein, the
representations and warranties contained in Article IV of the Credit Agreement
are true in all material respects on and as of the date hereof with the same
force and effect as if made on and as of the date hereof.

          2.4  After giving effect to the amendments contained herein, no Event
of Default or Unmatured Default exists or has occurred and is continuing on the
date hereof.

          ARTICLE III. CONDITIONS OF EFFECTIVENESS. This Amendment shall become
effective as of the date hereof when each of the following conditions is
satisfied or waived by the Lenders:

          3.1  The Company, the Guarantors and the Required Lenders shall have
signed this Amendment.

          3.2  The Company and the Guarantors shall have delivered such
resolutions, officer's certificates and legal opinions as the Agent may request.

          3.3  The Company and the Guarantors and Firstar Bank shall have
executed such agreements satisfactory to the Agent pursuant to which the Agent
is granted a first priority security interest in all bank accounts of the
Company and the Guarantors and such other rights with respect thereto as
required by the Agent.

          3.4  The Company shall have delivered to the Agent such other
documents and satisfied such other conditions, if any, as requested by the
Agent.

          ARTICLE IV. MISCELLANEOUS.

          4.1  References in the Credit Agreement or in any other Loan Document
to the Credit Agreement shall be deemed to be references to the Credit Agreement
as amended hereby and as further amended from time to time.

          4.2  The Company agrees to pay and to save the Agent harmless for the
payment of all reasonable documented costs and expenses arising in connection
with this Amendment, including the reasonable documented fees of counsel to the
Agent in connection with preparing this Amendment and the related documents.

          4.3  The Company and each Guarantor acknowledge and agree that, to the
best of their knowledge, the Agent and the Lenders have fully performed all of
their obligations under all documents executed in connection with the Credit
Agreement. The Company and each Guarantor represent and warrant that they are
not aware of any claims or causes of action against the Agent or any Lender.

          4.4  The Lenders and the Agent waive any Event of Default caused by
the occurrence of a Change of Control resulting from the existence prior to the
Third Amendment Effective Date of the Lien in favor of Christiania Bank og
Kreditkasse ASA, New York Branch referred to in Section 1.1.

                                 -2-
<PAGE>

          4.5  Except as expressly amended hereby, the Company and each
Guarantor agree that the Credit Agreement, the Notes, the Security Documents and
all other documents and agreements executed by the Company in connection with
the Credit Agreement in favor of the Agent or any Lender are ratified and
confirmed, as amended hereby, and shall remain in full force and effect in
accordance with their terms and that they are not aware of any set off,
counterclaim, defense or other claim or dispute with respect to any of the
foregoing. Terms used but not defined herein shall have the respective meanings
ascribed thereto in the Credit Agreement. This Amendment may be signed upon any
number of counterparts with the same effect as if the signatures thereto and
hereto were upon the same instrument, and telecopied signatures shall be
effective as originals.

                                -3-
<PAGE>

          IN WITNESS WHEREOF, the parties signing this Amendment have caused
this Amendment to be executed and delivered as of the day and year first above
written.

                               APCOA/STANDARD PARKING, INC.

                               By:
                                  ------------------------------

                               Its:
                                   -----------------------------

                               BANK ONE, NA, as a Lender and as Agent, formerly
                               known as The First National Bank of Chicago

                               By:
                                  --------------------------------

                               Its:
                                   -------------------------------

                               LASALLE BANK NATIONAL ASSOCIATION

                               By:
                                  --------------------------------

                               Its:
                                   -------------------------------

                                 -4-
<PAGE>

                             CONSENT AND AGREEMENT
                             ---------------------

          As of the date and year first above written, each of the undersigned
hereby:

     (a)  fully consents to the terms and provisions of the above Amendment and
the consummation of the transactions contemplated hereby and agrees to all terms
and provisions of the above Amendment applicable to it;

     (b)  agrees that each Guaranty and all other agreements executed by any of
the undersigned in connection with the Credit Agreement or otherwise in favor of
the Agent or the Lenders (collectively, the "Security Documents") are hereby
ratified and confirmed and shall remain in full force and effect, and each of
the undersigned acknowledges that it has no setoff, counterclaim or defense with
respect to any Security Document;

     (c)  acknowledges that its consent and agreement hereto is a condition to
the Banks' obligation under this Amendment and it is in its interest and to its
financial benefit to execute this consent and agreement.

                               A-1 AUTO PARK, INC.

                               By:
                                  --------------------------------
                                   Name:
                                   Title:

                               AP HOLDINGS, INC.

                               By:
                                  --------------------------------
                                   Name:
                                   Title:

                                      -5-
<PAGE>

                                  APCOA CAPITAL CORPORATION

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  APCOA-HAWAII, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  EVENTS PARKING CO., INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  HAWAII PARKING MAINTENANCE, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  METROPOLITAN PARKING SYSTEM, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  SENTINEL PARKING CO. OF OHIO, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  TOWER PARKING, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                      -6-
<PAGE>

                                  STANDARD AUTO PARK, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  STANDARD PARKING CORPORATION

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  APCOA LASALLE PARKING, LLC

                                  By: APCOA/Standard Parking Inc.
                                      as Manager

                                        By:
                                           -----------------------
                                           Name:
                                           Title:

                                  S & S PARKING, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  STANDARD PARKING CORPORATION, IL

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  CENTURY PARKING, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  SENTRY PARKING CORPORATION

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                  VIRGINIA PARKING SERVICES, INC.

                                  By:
                                     -----------------------------
                                     Name:
                                     Title:

                                      -7-<PAGE>   1
                                                                   EXHIBIT 10.18

                       CONTRACT FOR PURCHASE AND SALE # 42

May 25,2000                                                             Moscow

Company "OOO "Yuliksis" represented by its Director A.V. Sarukhanov acting on
the basis of the company's Charter, hereinafter referred to as "the Seller", and
company "ZAO "OXIRIS", hereinafter referred to as "the Buyer" and represented by
V.A. Dolgov, acting on the basis of the company's Charter, have made the present
contract for the following:

                           1. SUBJECT OF THE CONTRACT
1.1.  The Seller shall hand over the Goods (video products), and the Buyer shall
      pay for them as per the Seller's price list.
1.2.  The Goods shall be surrendered on the basis of the Buyer's oral or written
      application (sent by fax or otherwise). The number and the assortment of
      the Goods shall be fixed in waybills enclosed with each consignment.

                             2. PRICE OF THE GOODS
2.1.  Prices of the Goods shall be stated in rubles and indicated in waybills
      and proforma invoices enclosed with each consignment.

                 3. RIGHTS AND RESPONSIBILITIES OF THE PARTIES
3.1.  Rights and responsibilities of the Seller:
3.1.1.  The Seller shall deliver to the Buyer goods of proper quality, in
        conformity with certificates, other technical documents and sanitary
        regulations against the order made by the Buyer, within 24 hours of
        receipt of such order, subject to availability of the Goods at the
        Seller's warehouse.
3.1.2.   The Seller shall replace inferior goods and mis-delivered goods not
        listed in the Buyer's application within 5 (five) days of receipt of the
        Buyer's notification. Inferior Goods are Goods with visible or latent
        defects; Goods returned by third parties on account of defects which
        appeared through the Seller's fault and were not specified by him at the
        surrender of the Goods; and Goods the content of which fails to meet the
        requirements of the current legislation.
3.1.3.  In case the Goods are not available at the Seller's warehouse, the
        latter shall notify the Buyer of a possible delivery date within 24
        hours.
3.1.4.  The Seller shall make out the shipping documents.
3.1.5.  The Seller shall guarantee the quality of the Goods within the limits of
        the manufacturer's guarantee.
3.1.6.  The Seller shall warrant that the Goods delivered under the present
        Contract are distributed legally and that the intellectual property
        rights of third parties are not infringed.
3.2.    Rights and responsibilities of the Buyer
3.2.1.   The Buyer shall accept the Goods from the Seller on conditions EXW
         Moscow warehouse of the Seller.
3.2.2.   During the acceptance of the Goods the Buyer shall check their quantity
         and assortment, make out and sign appropriate documents, and inform the
         Seller of the defects detected during the acceptance of the Goods. The
         Buyer has a right

<PAGE>   2

         to refuse acceptance of the Goods in case their assortment or quantity
         does not correspond to that stated in the application.

                              4. TERMS OF PAYMENT
4.1. The Buyer shall pay for the Goods by bank transfer to the Seller's
     settlement account or by cash payment on the basis of the invoices issued
     by the Seller in accordance with the Buyer's applications.
4.2. The Buyer has a right to transfer an advance to the Seller's settlement
     account the amount of which shall be determined in accordance with the
     anticipated volume of purchases.

                          5. LIABILITY OF THE PARTIES
5.1. In case of non-fulfillment by one of the Parties of any provision of the
     present Contract, dispute shall be settled by way of negotiations. If the
     parties fail to come to an agreement, the case shall be referred to the
     International Arbitration Court at the Moscow Chamber of Trade and
     Commerce.

             6. TERM OF CONTRACT AND PROCEDURE FOR ITS TERMINATION
6.1. The contract shall come into effect upon being signed by the authorized
     representatives of the Parties.
6.2. The term of the present Contract shall be fixed at one calendar year. The
     Contract shall be prolonged automatically for the next term unless one of
     the Parties has given the other party a month's written notice of its
     termination or revision of the Contract.
6.3. The Contract can be terminated upon the request of one of the Parties
     subject to the condition that the other Party is given a written notice at
     least one month prior to the termination of the Contract.

                                7. FORCE-MAJEURE
In case of force-majeure circumstances brought about (directly or indirectly) by
such events as flood, fire, earthquake, epidemic, military conflicts, acts of
terrorism, civil unrest, strikes, directions, decrees and other administrative
interference of the government or other decrees, restrictions imposed by the
administration or the government, which influence the fulfillment of the
obligations under the Contract, or other circumstances beyond reasonable control
of the Parties, fulfillment of these obligations is postponed for the period of
duration of these circumstances, if they significantly affect the timely
performance of the whole Contract or a certain part of it due to be performed
after the beginning of force-majeure circumstances. The Parties are to give each
other an immediate written notification of the beginning and completion of the
force-majeure circumstances hindering the fulfillment of the obligations under
the Contract. The Party referring to force-majeure circumstances must provide a
certificate of the competent state body.

                              8. OTHER CONDITIONS
8.1. The Contract can be amended and supplemented by a written agreement of the
     Parties signed by the authorized representatives of the Parties.

<PAGE>   3

                  9. ADDRESSES AND BANK DETAILS OF THE PARTIES

<TABLE>
<CAPTION>
                     The Seller                                                     The Buyer
<S>                         <C>                         <C>                                <C>
Full name of the                                          Full name of the
organization:                                             organization:                      ZAO "OXIRIS"
Legal address:                Bldg.1, 12 Tverskaya        Legal address:                     12 Nauchnyi Proezd,
                              Str., Moscow 103009                                            Moscow 117802
Telephone number:                                         Telephone number:                  (095) 334 4411
Fax number:                                               Fax number:                        (095) 937 5060
Name of the bank:             "Rossiyskiy capital" stock  Name of the bank:                  Stock commercial bank
                              commercial bank                                                "Evrozapsibbank"
Settlement account:           4070281050008000000         Settlement account:                4070281070003000004
                              9                                                              9
Bank    identification code   044583266                   Bank    identification code        044585726
Correspondent account         3010181010000000026         Correspondent account              3010181000000000072
                              6                                                              6
TIN:                          7710321690                  TIN:                               7706200205
All-Russian industry          71100                       All-Russian    industry            71100, 71200
classification code                                       classification code
All-Russian enterprise        51274377                    All-Russian enterprise             51260913
and organization code                                     and organization code

                                                          Director General of ZAO "OXIRIS"

V.M. Korobov (Signature)                                  V.A. Dolgov (Signature)

May 25, 2000                                              May 25, 2000
Corporate seal                                            Corporate seal
</TABLE>

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