La. R.S. 2:810

Each recipient authority shall adopt a system of administration which provides for the approval of the department for any expenditures of funds appropriated from the Transportation Trust Fund, and no recipient authority shall expend such funds without the approval of the department. Funds appropriated for a project shall not be expended for any other purpose. All contracts for materials, construction, or services shall be advertised and awarded to the lowest responsible bidder in accordance with the provisions of R.S. 38:2212.