A Level CrossingAn intersection at the same elevation of a road and one or more rail tracks. See Manned Level Crossing, Automatic Level Crossing and Open Crossing. More which is operated by approaching trains and not Interlocked with protecting Signals. Road Traffic Signals (or Red/Green Stop Lights are provided). Additional pedestrian Signals may be provided at road crossings depending upon the number of pedestrian users. Half-Barriers may be provided, depending upon the type of crossingA cast or fabricated portion of the track layout which enables the rails of the two tracks to cross each other, while still providing support and guidance for s... More. See AHBCAbbreviated term for Automatic Half-Barrier Crossing. More, ABCLAbbreviated term for Automatic Barrier Crossing Locally Monitored. More, AOCLAbbreviated term for Automatic Open Crossing Locally Monitored. More, AOCRAbbreviated term for Automatic Open Crossing Remotely Monitored. More, MSLAbbreviated term for Miniature Stop Lights. More.