Louisiana Revised Statutes Tit. 32, § 82. Driving on divided highways

A. (1) Whenever any highway has been divided into two roadways by a median, physical barrier, or clearly indicated dividing section so constructed as to impede vehicular traffic, every vehicle shall be driven only upon the right hand roadway and no vehicle shall be driven over, across, or within the median, barrier, or section, except through an improved opening or at a crossover or intersection established under authority of this Chapter.

(2) No vehicle, other than an authorized vehicle, shall be driven through or use an improved opening or crossover on any interstate highway. For the purposes of this Paragraph, “authorized vehicle” means “authorized emergency vehicles”, as defined in R.S. 32:1, and towing and recovery vehicles operating under the direction of a law enforcement agency.