(2) The size, colour and type of traffic signals prescribed by this paragraph shall be as follows----
(a) three lights shall be used facing the stream of traffic which the signals are intended to control, one red, one amber and one green; (b) the lamps showing the coloured lights afore- said shall be arranged vertically, the lamp showing a red light being the uppermost and that showing the green light the lowermost; (c) each lamp shall be separately illuminated and the effective diameter of the lens thereof shall not be less than eight inches, nor more than eight and a quarter inches;
(d) the height of the centre of the green lens from the surface of the carriageway in the immediate vicinity shall be seven feet:
Provided that where desirable owing to road gradients this height may be increased to not more than eleven feet six inches;
(e) the centres of the lenses shall not be more
than fourteen inches apart;
(f) the head of the signals enclosing the lamps and the post. if any, on which it is supported shall be painted black and white in alternate horizontal bands;
(g) the sequence of the lights shown for the purpose of controlling vehicular traffic shall
be as follows-
(i) red;
(i) amber and red together;
(iii) green:
(iv) amber:
Provided that the lights referred to in sub-sub-paragraph (ii) may be omitted from the sequence.
(3) The size, colour and type of traffic signals prescribed by this paragraph shall be as follows-
(a) two lamps each showing an intermittent red
light shall be used;
(b) the lamps shall be arranged horizontally so that there is a distance of not less than one foot nine inches nor more than two feet three
Significance of traffic signals.
inches between the centres of the lenses of the lamps:
(c) cach lamp shall be separately illuminated and the effective diameter of the lens thereof shall be not less than eight inches nor more than eight and one quarter inches;
(d) when the signals are operated, each lamp shall show its intermittent red light at a rate of flashing of not less than fifty-four nor more than sixty-six flashes per minute, and in such a manner that the light of one lamp is always shown at a time when the light of the other lamp is not shown;
(e) the height of the centre of each lens from the surface of the carriageway in the immediate vicinity shall be in the case of signals placed at the side of the carriageway or on a street refuge not less than seven feet nor more than eleven feet six inches and in the case of signals placed elsewhere and over the carri- ageway not less than seventeen feet nor more than twenty feet.
12. (1) The significance of the traffic signals prescribed by paragraph (2) of regulation 11 shall be as follows-
(a) the red light shall be taken as prohibiting vehicular traffic to proceed beyond the stop line on the carriageway provided in conjunc- tion with the signals or, if the stop line is not for the time being visible or there is no stop line, beyond the signals until the green light is shown;
(b) the amber-with-red lights shall be taken to denote an impending change in the indica- tion given by the lights from red to green but shall not be taken to alter the prohibitory significance of the red light;
(c) the green light shall be taken to indicate that vehicular traffic may pass the signals and proceed straight on or to the left or to the right with due regard to the safety of other users of the road and subject to the direc- tions of any police officer or other duly authorized person who may be engaged in the regulation of traffic and subject further