Pub. L. 90-112, tit. IV, under "Limitation on General Expenses"
Limitation on General Expenses
Limitation on General Expenses For necessary expenses, not otherwise provided, for administration, operation, and research of the Federal Highway Administration, as authorized by law, not to exceed $59,927,000 shall lie paid, in accordance with law. from the appropriation “Federal-Aid Highways (Trust Fund)” (including advances and reimbursements): Provided, That appropriations available to the Federal Highway Administration shall lie available for hire of passenger motor vehicles; uniforms or allowances therefor authorized by law (5 U.S.C. 5901; 80 Stat. 299); and services as authorized by 5 U.S.C. 3109. Of the total amount made available during the current fiscal year for administration, operation, and research expenses of the Federal Highway Administration, $100,000 shall be available for carrying out the provisions of title 23, United States Code, section 309.