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Trains may approach a level crossing with a barrier from both directions. When a train is approaching, the barrier must be closed in good time and the traffic signal must be switched to red with the track-signalling unit. When the train has left the crossing and no further train is approaching, the barrier can be reopened and the traffic light can be switched over.
- 2 sensors for detecting whether a train from the right or left is on the level crossing.
- 2 sensors for detecting whether a train is coming from the right or left.
- 2 sensors for detecting whether the barrier is open (left or right).
- 2 sensors for detecting whether the barrier is closed (left or right).
- 1 actuator for closing the barrier.
- 1 actuator for switching on the red signal and 1 actuator for switching on the white signal.
