metropolitan area transit authority For grants to the Washington Metropolitan Area Transit Authority as authorized under section 601 of division B of Public Law 110–432 , $150,000,000, to remain available until expended: Provided , That the Secretary of Transportation shall approve grants for capital and preventive maintenance expenditures for the Washington Metropolitan Area Transit Authority only after receiving and reviewing a request for each specific project: Provided further , That prior to approving such grants, the Secretary shall certify that the Washington Metropolitan Area Transit Authority is making progress to improve its safety management system in response to the Federal Transit Administration’s 2015 safety management inspection: Provided further , That the Secretary shall determine that the Washington Metropolitan Area Transit Authority has placed the highest priority on those investments that will improve the safety of the system before approving such grants: Provided further , That the Secretary, in order to ensure safety throughout the rail system, may waive the requirements of section 601(e)(1) of division B of Public Law 110–432 . Administrative provisions—federal transit administration 160. The limitations on obligations for the programs of the Federal Transit Administration shall not apply to any authority under 49 U.S.C. 5338 , previously made available for obligation, or to any other authority previously made available for obligation. 161. Notwithstanding any other provision of law, funds appropriated or limited by this Act under the heading ‘‘Fixed Guideway Capital Investment’’ of the Federal Transit Administration for projects specified in this Act or identified in reports accompanying this Act not obligated by September 30, 2024, and other recoveries, shall be directed to projects eligible to use the funds for the purposes for which they were originally provided. 162. Notwithstanding any other provision of law, any funds appropriated before October 1, 2018, under any section of