Mississippi Code Title 63. Motor Vehicles & Traffic Regulations § 63-7-47

(1) Whenever the load upon any vehicle extends to the rear four (4) feet or more beyond the rear or body of such vehicle, there shall be displayed at the extreme rear end of the load a red flag or cloth not less than sixteen (16) inches square.

(2) During the period described in Section 63-7-11, any vehicle transporting a load of timber products that extends four (4) feet or more beyond the rear or body of that vehicle, shall have affixed as close as practical to the end of the load a rotating or oscillating amber strobe-type lamp or light-emitting diode light.