The calculated speed of a train approaching a SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. at which the SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. is
permitted to clearA Colour Light Signal that is displaying a Proceed Aspect or a Semaphore Signal in the Off position. to a less restrictive AspectAny valid visual indication of a Signal as displayed to the driver..