Ala. Code § 23-1-313
The authority shall pay out of the proceeds from the sale of the obligations authorized by this article all expenses that the board of directors may deem necessary and advantageous in connection with the sale and issuance thereof. The proceeds from the issue of any obligations authorized by this article, (i) except the proceeds of bonds which were issued to pay principal and interest of temporary bonds or notes and in anticipation of which such temporary bonds or notes shall have been issued, and (ii) except the proceeds of refunding bonds issued to refund any outstanding obligation, remaining after paying the expenses of their sale and issuance, shall be deposited in the State Treasury, shall be credited to the Road and Bridge Fund and shall be subject to be withdrawn by the authority, upon the approval of the State Department of Transportation and the Governor, but only for the purpose of paying the federal share of the cost of federal aid projects or work incidental or related to any such construction within the state (including the acquisition of property necessary for such construction and related work) to be repaid to the state by the federal government, and such proceeds shall be used for no other purpose. The proceeds from the sale of the obligations shall not be expended for any highway construction project until such time as the United States Secretary of Transportation or his or her designated representative shall have approved the design and location of the project, shall have formally stated in writing that such project will be eligible for federal aid matching funds when such funds become available and shall have entered into a written agreement providing for the repayment of such funds. Provided, however, in cases where the Federal Highway Administration has delegated the authority to the State Department of Transportation to approve the design, location, and programming of federal funds for certain federal aid projects or classes of projects, then the approval by the State Department of Transportation shall be sufficient. Proceeds of bonds issued to provide funds for payment of the principal of and interest on temporary bonds or notes issued in anticipation of the sale and issuance of such bonds shall be used solely for the purpose of paying the expenses of the sale and issuance of such bonds and the payment of the principal of and interest on such temporary bonds or notes. Proceeds of refunding bonds issued for the purpose of refunding any outstanding obligations of the authority remaining after payment of the expenses of their issuance shall be used solely for payment of the principal of and interest on such outstanding obligations of the authority and for paying any premium that may be necessary to be paid in order to redeem and retire the obligations to be refunded.
Ala. Code § 23-1-313 (1975)