S.C. Code Ann. § 56-5-4760: Identification lamps for large commercial vehicles.

Any commercial vehicle eighty inches or more in over-all width may be equipped with not more than three identification lamps showing to the front which shall emit an amber light without glare and not more than three identification lamps showing to the rear which shall emit a red light without glare. Such lamps shall be placed in a row and may be mounted either horizontally or vertically.