If this signal is next it will trigger an AWS horn in the form of a loud continuous beep and must be acknowledged by the driver by pressing Q or by clicking the warning symbol.Ī yellow aspect ( Caution) tells the driver that the next signal can be red ( Danger) and that they must slow down in preparation to stop at the next signal. An unofficial advised speed past this signal is 70-80 mph. The next aspect will always be yellow unless it changes as more of the train's route is clear. This ping does not have to be acknowledged and is there to alert the driver.Ī double yellow aspect ( Preliminary Caution) tells the driver that their route is not clear after two signals ahead and they must slow down in preparation to stop at the red signal. If this signal is next it will trigger an electrical ping from the AWS. The next aspect is usually green but can sometimes be (double) yellow. The sensor in question will then report its status to a signalling centre and will change the signal aspects behind it to tell drivers that they need to slow down and stop as their route cannot be set due to a conflicting move or train in front.Ī green aspect ( Proceed) tells the driver that their route is clear and that they can proceed at line speed. Signals work by using sensors mounted on the track to check if a train is present.
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