Ala. Code § 33-17-9
The aggregate monetary obligation that the authority may incur in connection with its contracts shall not at any time exceed the sum of
No contract involving the expenditure of money, whether now or later, shall be approved or ratified by the board of directors unless the resolution approving or ratifying the same shall include a determination that there will be compliance with the preceding limitation when the amount of the obligation of the contract in question has been added to the already existing obligations of the authority. This determination by the board of directors shall be conclusive of the question of compliance.
All contracts of the authority for the construction, reconstruction, relocation, maintenance and operation of highways, roads and bridges, and work incidental or related thereto, and the acquisition of property necessary therefor, shall be in writing, shall be subject to the rules and regulations and shall be let under the supervision of the Highway Department, and shall be subject to approval by the Governor and by the Highway Department. All work provided for in any such contract shall be supervised by the Highway Department. All persons engaging in the supervision or performance of any work involving highways, roads and bridges that may be done by the authority without the award of a contract therefor shall be employees of the Highway Department.
All contracts of the authority for the construction, reconstruction or relocation of any facilities or structures and all purchases of equipment by the authority shall be made on the basis of competitive bidding in the manner and according to the procedures provided in Sections 39-2-1 through 39-2-13 and 41-16-20 through 41-16-32, and any other applicable statutes.
Ala. Code § 33-17-9 (1975)