Assistance Program in this account, and for payment of obligations incurred in carrying out the provisions of 49 U.S.C. 5305 , 5307, 5310, 5311, 5312, 5314, 5318, 5329(e)(6), 5335, 5337, 5339, and 5340, as amended by the Fixing America's Surface Transportation Act, section 20005(b) of Public Law 112–141 , and section 3006(b) of the Fixing America's Surface Transportation Act, $10,800,000,000, to be derived from the Mass Transit Account of the Highway Trust Fund and to remain available until expended: Provided , That funds available for the implementation or execution of programs authorized under 49 U.S.C. 5305 , 5307, 5310, 5311, 5312, 5314, 5318, 5329(e)(6), 5335, 5337, 5339, and 5340, as amended by the Fixing America's Surface Transportation Act, section 20005(b) of Public Law 112–141 , and section 3006(b) of the Fixing America's Surface Transportation Act, shall not exceed total obligations of $10,150,348,462 in fiscal year 2020: Provided further , That the Federal share of the cost of activities carried out under 49 U.S.C. section 5312 shall not exceed 80 percent, except that if there is substantial public interest or benefit, the Secretary may approve a greater Federal share: Provided further , That in addition to the amounts appropriated for purposes of 49 U.S.C 5338(e), not less than 2 percent of the funds appropriated or available for the purposes of 49 U.S.C 5338(f) shall be available for the purposes of 49 U.S.C. 5338(e) . Transit infrastructure grants For an additional amount for buses and bus facilities grants under section 5339 of title 49, United States Code, state of good repair grants under section 5337 of such title, the bus testing facilities under sections 5312 and 5318 of such title, and for grants to areas of persistent poverty, $750,000,000 (increased by $2,000,000), to remain available until expended: Provided , That of the sums provided under this heading— (1) $389,000,000 (reduced by $6,000,000) shall be available for the buses and bus facilities competitive grants as authorized under