S.C. Code Ann. § 56-5-5110: Display of flags when vehicle disabled in daytime.

Whenever any vehicle of a type referred to in Sections 56-5-5090 and 56-5-5100 is disabled upon the traveled portion of a highway or the shoulder thereof, outside of any municipality, at any time when the display of fusees, flares or electric lanterns is not required, the driver of such vehicle shall display two red flags upon the roadway in the lane of traffic occupied by the disabled vehicle, one at a distance of approximately one hundred feet in advance of the vehicle and one at a distance of approximately one hundred feet to the rear of the vehicle.