La. Roads, Bridges and Ferries § 48:2141
When the bonds issued for any project and the interest thereon have been paid in full, or sufficient funds have been deposited in trust for that purpose, and the project is in a condition which meets department standards for structural condition and geometric design and is in a condition of maintenance satisfactory to the department, such project and any property acquired for the project may be transferred by the board, on behalf of the authority, in full ownership to the state of Louisiana. The department will assume jurisdiction and control of the project as a part of the state highway system, provided that the legislature authorizes an increase in mileage of the state highway system equal to the length of the authority project to be transferred. Any authority project transferred to and accepted by the department will be operated and maintained by the department as an integral part of the state highway system, and the department, in the discretion of its secretary, may continue to collect any toll or fee for the purpose of maintenance of the project.
La. Roads, Bridges and Ferries § 48:2141