Any AspectAny valid visual indication of a Signal as displayed to the driver. More that advises a driver that the train is required to stop at a SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. More
ahead. See Caution (Aspect)An Aspect which advises the driver that the next Signal may be at Danger. It is indicated by a Single Yellow (Aspect) or a Semaphore Distant arm horizontal. More, First CautionA Signal which gives the driver the first indication of a need to stop at a Signal ahead. See also Caution (Aspect) and Preliminary Caution (Aspect). More and Preliminary Caution
(AspectAny valid visual indication of a Signal as displayed to the driver. More).