La. Roads, Bridges and Ferries § 48:306
In connection with the development of any controlled-access facility, the highway authorities may plan, designate, establish, use, regulate, alter, improve, maintain, and vacate local service roads and streets or designate as local service roads and streets any existing road or street and exercise jurisdiction over service roads in the same manner as is authorized over controlled-access facilities under the terms of this Part when they determine the local service roads and streets are necessary or desirable. The local service roads or streets shall be of appropriate design, and shall be separated from the controlled-access facility proper by means of all devices designated as necessary or desirable by the proper highway authority.
La. Roads, Bridges and Ferries § 48:306