(1) Signal shall be treated as defective when-, (a) if there is no fixed signal or it is not erected properly at a place where a fixed signal is ordinarily shown; or
(b) if the light of a signal is not burning; or
(c) if a white light is shown in place of a colour light; or
(d) if the aspect of a signal is flickering, misleading or imperfectly shown; and
(e) if more than one aspect is displayed.
(2) On encountering a defective signal, the Loco pilot shall act as if the signal was showing its most restrictive aspect.
(3) at stations equipped with a colour light signal provided with a 'P' marker, the Loco pilot shall bring his train to a stand if it does not show any light or shows an imperfect aspect and having satisfied himself that the signal is provided with 'P' marker, shall proceed preparing to stop at the next Stop signal and shall be guided further by its aspect.
256 THE GAZETTE OF INDIA : EXTRAORDINARY [PART II—SEC. 3(i)]
(4) A five lamp direction type route indicator shall be treated as defective if less than three lamps are lit.