S.C. Code Ann. § 56-5-2370: Highway construction and maintenance.

(a) The driver of a vehicle shall yield the right-of-way to any authorized vehicle or pedestrian actually engaged in work upon a highway within any highway traffic construction or maintenance area indicated by official traffic-control devices.

(b) The driver of a vehicle shall yield the right-of-way to any authorized vehicle obviously and actually engaged in work upon a highway whenever such vehicle displays flashing lights meeting the requirements of Section 56-5-4650.