A Red AspectAny valid visual indication of a Signal as displayed to the driver. More in a Colour Light SignalA Signal that conveys its information by coloured lights. More, or the arm of a Semaphore SignalA Signal which informs a driver by means of the position of a mechanical arm during daylight and coloured lights during darkness. More in
the horizontal position, denoting ‘stop’ or ‘caution’, or Distant SignalA Signal (not itself a Stop Signal) capable of displaying a Cautionary Aspect that informs the driver of the state of the Signals or Level Crossing ahead. More at most
restrictive aspectAny valid visual indication of a Signal as displayed to the driver. More.