Any motor vehicle may be equipped, and when required under this chapter shall be equipped, with the following signal lamps and devices:
A stop lamp shall be plainly visible and understandable from a distance of one hundred feet to the rear both during normal sunlight and at nighttime and a signal lamp or lamps indicating intention to turn shall be visible and understandable during daytime and nighttime from a distance of one hundred feet both to the front and rear. When a vehicle is equipped with a stop lamp or other signal lamps, such lamp or lamps shall at all times be maintained in good working condition. No stop lamp or signal lamp shall project a glaring or dazzling light.
All mechanical signal devices shall be self-illuminated when in use at the times specified in Section 56-5-4450.
When a vehicle is so constructed or loaded that a hand-and-arm signal would not be visible both to the front and rear of such vehicle, such vehicle shall be equipped with such signal devices as are described in this section.
S.C. Code § 56-5-4730