Louisiana Revised Statutes Tit. 32, § 64. General speed law

A. No person shall drive a vehicle on the highway within this state at a speed greater than is reasonable and prudent under the conditions and potential hazards then existing, having due regard for the traffic on, and the surface and width of, the highway, and the condition of the weather, and in no event at a speed in excess of the maximum speeds established by this Chapter or regulation of the department made pursuant thereto.

B. Except when a special hazard exists that requires lower speed for compliance with paragraph A of this section, no person shall operate or drive a motor vehicle upon the highways of this state at such a slow speed as to impede the normal and reasonable movement of traffic.

C. Rolling roadblocks shall be prohibited from operating on all Interstate highways in the state.