S.C. Code Ann. § 56-1-2112

(A) A driver who is convicted of operating a commercial motor vehicle in violation of a federal, state, or local law or regulation pertaining to one of the following six offenses at a railroad-highway grade crossing is disqualified from operating a commercial motor vehicle for the period of time specified in subsection (B): (1) for drivers who are not required to always stop, failing to slow down and check that the tracks are clear of an approaching train; (2) for drivers who are not required to always stop, failing to stop before reaching the crossing, if the tracks are not clear; (3) for drivers who are always required to stop, failing to stop before driving onto the crossing; (4) for all drivers, failing to have sufficient space to drive completely through the crossing without stopping; (5) for all drivers, failing to obey a traffic control device or the directions of an enforcement official at the crossing; (6) for all drivers, failing to negotiate a crossing because of insufficient undercarriage clearance. (B) A person is disqualified from driving a commercial motor vehicle for committing an offense contained in subsection (A) for not less than: (1) sixty days for the first conviction committed in a commercial motor vehicle; (2) one hundred twenty days for the second conviction committed in a commercial motor vehicle arising from separate incidents occurring within a three-year period; and (3) one year for the third or subsequent conviction committed in a commercial motor vehicle arising from separate incidents occurring within a three-year period.