Light emitted from a SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. More lens assembly that has originated from an
external source (usually the sun) and has been internally reflected within
the Signal HeadThe part of a Colour Light Signal from which the Aspects are displayed. More in such a way that the lens assembly gives the
appearance of being litThe internal illumination of signalling equipment. More.