for necessary expenses related to the consequences of Hurricane Harvey: Provided, That such amount is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. Federal highway administration Federal-aid highways Emergency relief program For an additional amount for the Emergency Relief Program as authorized under section 125 of title 23, United States Code, $6,500,000,000, to remain available until expended: Provided , That the obligations for projects under this section resulting from a single natural disaster or a single catastrophic failure in a State shall not exceed $300,000,000: Provided further, That notwithstanding the preceding proviso, the Secretary of Transportation may obligate more than $100,000,000, but not more than $500,000,000, for a single natural disaster event in a State for emergency relief projects arising from damage caused in calendar year 2017 by Hurricane Harvey: Provided further, That no funds provided in this Act shall be used for section 125(g) of such title: Provided further, That the amount provided under this heading is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. Federal transit administration Public transportation emergency relief program (including transfer of funds) For the Public Transportation Emergency Relief Program as authorized under section 5324 of title 49, United States Code, $33,000,000,000, to remain available until expended, for recovery and relief efforts in the areas most affected by Hurricane Harvey: Provided, That not more than $10,000,000,000 shall be made available not later than 60 days after the enactment of this Act: Provided further, That the remainder of the funds shall be made available only after the Federal Transit Administration and the Federal Emergency Management Agency sign the Memorandum of Agreement required by section