La. Roads, Bridges and Ferries § 48:945
As soon as any bridge authorized in this Part is put into operation, the department shall arrange for and supervise the collection of tolls for the use of the bridge. The rate of toll shall be determined by the department. The rates so fixed shall be such as to anticipate the retirement of the bonds issued for the construction of the bridge in not more than twenty years. The toll rates shall be posted in a conspicuous place at each end of the bridge or its approaches and at the places of collecting the tolls.
Commuters' tickets for those making frequent use of a particular bridge may be sold at reduced rates upon such terms and subject to such restrictions as are determined by the department of highways.
The department of highways shall report and pay into the state treasury all of the funds so derived by it from the bridges.
La. Roads, Bridges and Ferries § 48:945