23 U.S.C. § 121 - U.S. Code - Unannotated Title 23. Highways § 121. Payment to States for construction

(a) In general.--The Secretary, from time to time as the work progresses, may make payments to a State for costs of construction incurred by the State on a project (including payments made pursuant to a long-term concession agreement, such as availability payments). Such payments may also be made for the value of the materials--

(b) Project agreement.--No payment shall be made under this chapter except for a project covered by a project agreement. After completion of the project in accordance with the project agreement, a State shall be entitled to payment out of the appropriate sums apportioned or allocated to the State of the unpaid balance of the Federal share payable for such project.

(c) Such payments shall be made to such official or officials or depository as may be designated by the State transportation department and authorized under the laws of the State to receive public funds of the State.