S.C. Code Ann. § 56-5-3280: Bridge and railroad signals.

(a) No pedestrian shall enter or remain upon any bridge or approach thereto beyond the bridge signal, gate or barrier after a bridge operation signal indication has been given.

(b) No pedestrian shall pass through, around, over or under any crossing gate or barrier at a railroad grade crossing or bridge while such gate or barrier is closed or is being opened or closed.