; (2) $100,000,000 shall be for necessary expenses for construction of the Appalachian Development Highway System, as authorized under section 1069(y) of Public Law 102–240 : Provided, That for the purposes of funds made available under this paragraph, the term Appalachian State means a State that contains 1 or more counties (including any political subdivision located within the area) in the Appalachian region as defined in section 14102(a) of title 40, United States Code: Provided further, That funds made available under this heading for construction of the Appalachian Development Highway System shall remain available until expended: Provided further, That, except as provided in the following proviso, funds made available under this heading for construction of the Appalachian Development Highway System shall be administered as if apportioned under chapter 1 of title 23, United States Code: Provided further, That a project carried out with funds made available under this heading for construction of the Appalachian Development Highway System shall be carried out in the same manner as a project under section 14501 of title 40, United States Code: Provided further, That subject to the following proviso, funds made available under this heading for construction of the Appalachian Development Highway System shall be apportioned to Appalachian States according to the percentages derived from the 2012 Appalachian Development Highway System Cost-to-Complete Estimate, adopted in Appalachian Regional Commission Resolution Number 736, and confirmed as each Appalachian State’s relative share of the estimated remaining need to complete the Appalachian Development Highway System, adjusted to exclude those corridors that such States have no current plans to complete, as reported in the 2013 Appalachian Development Highway System Completion Report, unless those States have modified and assigned a higher priority for completion of an Appalachian Development Highway System corridor, as reported in the 2020 Appalachian Development