S.D. Codified Laws § 32-17-26
Lights on other vehicles--Color and visibility--Violation as petty offense
All vehicles not required in §§ 32-17-1 to 32-17-25 , inclusive, to be equipped with specified lighted lamps shall carry one or more lighted lamps or lanterns displaying a white light visible under normal atmospheric conditions from a distance of at least five hundred feet to the front and to the rear of such vehicle. A violation of this section is a petty offense.
Source: SDC 1939, § 44.0352 (12); SL 1989, ch 255, § 56.