S.C. Code Ann. § 58-17-1430

Every railroad company shall, within the time indicated by the Commission or county supervisor, as the case may be, or within the time given by the civil engineer to such corporation upon re-examination, maintain and construct such crossing in the manner demanded of it by the Commission or county supervisor, as the case may be, or civil engineer, or station a flagman, if such should be required, at the locality where it has been found necessary, as aforesaid.