S.C. Code Ann. § 56-5-1850
(a) The driver of a vehicle may overtake and pass upon the right of another vehicle only under the following conditions:
1. When the vehicle overtaken is making or about to make a left turn.
2. Upon a roadway with unobstructed pavement of sufficient width for two or more lines of vehicles moving lawfully in the direction being travelled by the overtaking vehicle.
HISTORY: 1962 Code Section 46-385; 1952 Code Section 46-385; 1949 (46) 466; 1977 Act No. 143 Section 2.