Miss. Code Ann. § 63-7-91

When any vehicle, whether pulled, towed, self-propelled or animal-drawn, which is not under ordinary circumstances moved, operated or driven at a speed in excess of twenty-five (25) miles per hour, is moved, operated or driven on any public highway or city street which is open for vehicular travel, it shall display a triangular slow-moving-vehicle emblem or high intensity reflectorized tape mounted as near as practicable to the center of the mass and at an approximate height of not less than two (2) nor more than six (6) feet from level ground or pavement surface. In any event, the emblem or tape shall be mounted so as to be entirely visible from the rear, day or night; and the emblem or tape and its position of mounting on the vehicle shall meet the specifications established by rules and regulations properly adopted and promulgated by the Commissioner of Public Safety. Except in cases of emergency, vehicles subject to the provisions of this section that display the reflectorized tape shall not be operated upon any highway on the designated state highway system during the period from sunset to sunrise.