A SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. AspectAny valid visual indication of a Signal as displayed to the driver. which informs the driver to expect the next SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. to be at
Caution. It is indicated by a Double YellowA Preliminary Caution displayed by a Colour Light Signal in Four Aspect Signalling informing the driver to expect the next Main Signal to be at Single Yellow AspectAny valid visual indication of a Signal as displayed to the driver..