110 STAT. 2958 PUBLIC LAW 104-205—SEPT. 30, 1996 assets pertaining to the services to be provided by such fund, either on hand or on order, less the related liabilities or unpaid obligations, and any appropriations made prior to the current year for the purpose of providing capital shall be used to capitalize such fund: Provided further, That such fund shall be paid in advance from funds available to the FAA and other Federal agencies for which such centralized services are performed, at rates which will return in full all expenses of operation, including accrued leave, depreciation of fund plant and equipment, amortization of Automated Data Processing (ADP) software and systems (either required or donated), and an amount necessary to maintain a reasonable operating reserve, as determined by the FAA Administrator: Provided further. That such fund shall provide services on a competitive basis: Provided further. That an amount not to exceed four percent of the total annual income to such fund may be retained in the fund for fiscal year 1997 and each year thereafter, to remain available until expended, to be used for the acquisition of capital equipment and for the improvement and implementation of FAA financial management, ADP, and support systems: Provided further. That no later than thirty days after the end of each fiscal year, amounts in excess of this reserve limitation shall be transferred to miscellaneous receipts in the Treasury. FEDERAL HIGHWAY ADMINISTRATION LIMITATION ON GENERAL OPERATING EXPENSES Necessary expenses for administration, operation, including motor carrier safety program operations, and research of the Federal Highway Administration not to exceed $521,114,000 shall be paid in accordance with law from appropriations made available by this Act to the Federal Highway Administration together with advances and reimbursements received by the Federal Highway Administration: Provided, That $221,958,000 of the amount provided herein shall remain available until September 30, 1999. HIGHWAY-RELATED SAFETY GRANTS (LIQUIDATION OF CONTRACT AUTHORIZATION) (HIGHWAY TRUST FUND) For payment of obligations incurred in carrying out the provisions of title 23, United States Code, section 402 administered by the Federal Highway Administration, to remain available until expended, $2,049,000 to be derived from the Highway Trust Fund. FEDERAL-AID HIGHWAYS (LIMITATION ON OBLIGATIONS) (HIGHWAY TRUST FUND) 23 USC 104 note. None of the funds in this Act shall be available for the implementation or execution of programs the obligations for which are in excess of $18,000,000,000 for Federal-aid highways and highway safety construction programs for fiscal year 1997.