; and (ii) the equivalent amount of obligation limitation for the fiscal year in which the Secretary makes a transfer under subsection (f)(2). (5) TIFIA program The term TIFIA program has the meaning given the term in section 601(a). (b) Establishment The Secretary shall establish a program, to be known as the Balance Exchanges for Infrastructure Program , in accordance with this section to provide flexibility for the Secretary and States to improve highway infrastructure. (c) Offer To fund projects or exchange funds (1) Solicitation For each fiscal year for which an amount is reserved under subsection (f)(1), the Secretary shall— (A) not later than December 1 of that fiscal year— (i) solicit requests from Appalachian States to return amounts under subsection (d)(1)(A); and (ii) solicit applications from Appalachian States for grants under subsection (e); and (B) require that, not later than 60 days after the date of the solicitations under subparagraph (A), each Appalachian State that elects to participate in the program shall submit to the Secretary either— (i) a request that describes the amount that the Appalachian State requests to return under subsection (d)(1)(A); or (ii) an application for a grant under subsection (e). (d) Exchange agreements (1) In general The Secretary shall enter into an agreement with each Appalachian State that submits a request under subsection (c)(1)(A)(i) under which— (A) the Appalachian State shall return to the Secretary all, or at the discretion of the Appalachian State, a portion of, the unobligated amounts from the Highway Trust Fund (including the applicable amount of contract authority and an equal amount of special no-year obligation limitation associated with that contract authority) apportioned to the Appalachian State for the Appalachian development highway system under section 14501 of title 40 (but not including any amounts made available by an appropriations Act without an initial authorization)