In addition to other equipment required in this article, the vehicles listed below must be equipped as provided in this section when operated under the conditions stated in § 56-5-4570:

(1) On every bus or truck, whatever its size, on the rear, two reflectors, one on each side and one stop light;

(2) On every bus or truck eighty inches or more in over-all width, in addition to the requirements in item (1),

(a) on the front, two clearance lamps, one at each side,

(b) on the rear, two clearance lamps, one at each side,

(c) on each side, two side-marker lamps, one at or near the front and one at or near the rear, and

(d) on each side, two reflectors, one at or near the front and one at or near the rear;

(3) On every truck tractor,

(a) on the front, two clearance lamps, one at each side, and

(b) on the rear, one stop light;

(4) On every trailer or semitrailer having a gross weight in excess of three thousand pounds,

(a) on the front, two clearance lamps, one at each side,

(b) on each side, two side-marker lamps, one at or near the front and one at or near the rear,

(c) on each side, two reflectors, one at or near the front and one at or near the rear, and

(d) on the rear, two clearance lamps, one at each side, and also two reflectors, one at each side, and one stop light;

(5) On every pole trailer in excess of three thousand pounds gross weight,

(a) on each side, one side-marker lamp and one clearance lamp, which may be in combination, to show to the front, side, and rear, and

(b) on the rear of the pole trailer or load, two reflectors, one at each side;

(6) On every trailer, semitrailer, or pole trailer weighing three thousand pounds gross or less, on the rear two reflectors, one on each side. If a trailer or semitrailer is loaded or is of dimensions so as to obscure the stop light on the towing vehicle then the vehicle also must be equipped with one stop light;

(7) On every pole truck or trailer, a strip of light reflecting paint, tape, or reflectors on the external sides of the pole support frame or bolsters, or both, where practical.