Trailers whose load does not obscure the directional signals of the towing vehicle from the view of a driver approaching the vehicle from the rear within 200 feet, and trailers with a gross weight of 4,000 lbs. or less, do not need turn signals.
Trailers with a gross weight of less than 4,000 lbs. need not be equipped with a rear tail lamp, provided that the trailer is equipped with 2 red rear reflectors with a diameter of at least 3 inches that are visible from a distance of at least 500 feet when opposed by a vehicle with lighted headlamps.
Every trailer or semitrailer with a gross weight of 4,000 lbs. or more must also have: on the front, 2 clearance lamps, with 1 on each side; on each side, 2 side marker lamps and 2 reflectors, with 1 of each at or near the front and at or near the rear; and on the rear, 2 clearance lamps and 2 reflectors, with 1 of each at either side, and 1 stoplight.
Every pole trailer with a gross weight of 4,000 lbs. or more must also have: on each side, 1 side marker lamp and 1 clearance lamp (which may be in combination) to show the front, side, and rear; and on the rear, 2 reflectors, with 1 on each side.
Every trailer, semitrailer, or pole trailer with a gross weight below 4,000 lbs. must also have: 2 reflectors, with 1 on each side, on the rear of the vehicle.
On every trailer or semitrailer 30 feet or more in length and weighing at least 4,000 lbs., 1 combination marker lamp showing amber and mounted on the bottom side rail at or near the center of each side of the trailer is required.