S.C. Code Ann. § 56-5-4700 – Audible signal devices and signal lamps for authorized emergency vehicles, school buses and police vehicles; restrictions on use; effect of use

(a) Every authorized emergency vehicle shall, in addition to any other equipment and distinctive markings required by this chapter, be equipped with a siren, exhaust whistle or bell capable of giving an audible signal.
(b) Every school bus and every authorized emergency vehicle shall, in addition to any other equipment and distinctive markings required by this chapter, be equipped with signal lamps mounted as high and as widely spaced laterally as practicable, which shall be capable of displaying to the front two alternately flashing red lights located at the same level and to the rear two alternately flashing red lights located at the same level, and these lights shall have sufficient intensity to be visible at five hundred feet in normal sunlight. Provided, that vehicles of any fire department or funeral home when equipped with a mounted, oscillating, rotating or flashing red light, visible in all directions for a distance of five hundred feet in normal sunlight, shall not be required to have additional signal lamps.
(c) A police vehicle when used as an authorized emergency vehicle may but need not be equipped with alternately flashing red lights as specified herein. Also, such vehicle may in lieu of the alternately flashing red lights be equipped with a special dome-mounted oscillating, rotating, or flashing red or blue light visible from a distance of five hundred feet to the front in normal sunlight; provided, that it shall be unlawful for any person to possess any flashing, oscillating or rotating blue light on any vehicle except one used primarily for law enforcement purposes.
Provided, further, that after January 1, 1967, all police vehicles when used as an authorized emergency vehicle shall then be equipped with dome-mounted, oscillating, rotating or flashing blue lights visible from a distance of five hundred feet.
(d) The alternately flashing lighting described in subsection (b) of this section shall not be used on any vehicle other than an authorized emergency vehicle. Provided, that a school bus may use the alternately flashing red lighting described in subsection (b), or red flashing lights in the rear and amber flashing lights in the front.
(e) The use of the signal equipment described herein shall impose upon drivers of other vehicles the obligation to yield right-of-way and stop as prescribed in Sections 56-5-2360 and 56-5-2770.