61-8-312. Special speed limitations on trucks, truck tractors, and motor-driven cycles. (1) Except as provided in 61-8-303, 61-8-309, 61-8-310, and subsection (2) of this section, the speed limit for a truck or truck tractor of more than 1 ton "manufacturer's rated capacity" traveling on:
(a) an interstate highway, as defined in 60-1-103, is 70 miles an hour; and
(b) any other public highway is 65 miles an hour.
(2) Except as provided in 61-8-303, 61-8-309, and 61-8-310, the speed limit for a vehicle subject to a term permit under 61-10-124(2)(d) or a truck-trailer-trailer or truck tractor-semitrailer-trailer-trailer combination of vehicles subject to special permits under 61-10-124(4) is 65 miles an hour unless otherwise stated in the permit.
(3) A person may not operate a motor-driven cycle at any time mentioned in 61-9-201 at a speed greater than 35 miles an hour unless the motor-driven cycle is equipped with a headlamp or lamps that are adequate to reveal a person or vehicle at a distance of 300 feet ahead.