How does a grade crossing supervised circuit work?

A grade crossing supervised circuit operates by using sensors to detect the presence of trains approaching the crossing. When a train is detected, the system activates warning signals, such as flashing lights and gates, to alert motorists and pedestrians of the oncoming train. The circuit continuously monitors the crossing area, ensuring that the warning signals remain active until the train has cleared the crossing. This system enhances safety by preventing accidents at railway crossings.