Page:The Traffic Signs Regulations and General Directions 1975 (UKSI 1975-1536).pdf/25

 (g) The height of the centres of the lenses comprising the lower of the horizontal pairs from the surface of the carriageway in the immediate vicinity shall be in the case of signals placed at the side of the carriageway not less than 1.8 nor more than 3.2 metres and in the case of signals placed over the carriageway not less than 5.8 nor more than 6.8 metres.

(h) No lettering of any kind shall be used upon any of the lenses.

(4) The size, colour and type of light signals prescribed by this paragraph shall be as follows:—

(a) two lamps each showing an intermittent red light and one lamp showing a steady amber light shall be used;

(b) the lamps showing an intermittent red light shall be arranged horizontally so that there is a distance of not less than 585 nor more than 665 millimetres between the centres of the lenses of the lamps;

(c) the lamp showing the amber light shall be placed below the red lenses in such a position that a vertical line passing through the centre of that lamp is horizontally equidistant from a vertical line passing through the centre of each red lens and that the vertical distance between a horizontal line passing through the centre of that lamp and a horizontal line passing through the centres of the red lenses is not less than 235 nor more than 345 millimetres;

(d) each lamp shall be separately illuminated and the effective diameter of the lens thereof shall be not less than 195 nor more than 220 millimetres;

(e) when the lamps showing an intermittent red light are operated, each such lamp shall show a red light at a rate of flashing of not less than 60 nor more than 90 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;

(f) the height of the centre of the amber 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 2.4 nor more than 4 metres and in the case of signals placed elsewhere and over the carriageway not less than 6.1 nor more than 9 metres;

(g) the lenses shall be provided with a rectangular backing board having an overall width of not less than 1.3 metres and extending not less than 300 millimetres above the centre of each of the red lenses and not less than 300 millimetres below the centre of the amber lens, which board shall be coloured black, save for a white border having a width of not less than 80 nor more than 100 millimetres on the side from which the lamps show;

(h) the sequence of the signal lights under this paragraph shown for the purpose of controlling vehicular traffic shall be amber followed by red; no lettering of any kind shall appear on any of the lenses.

(5) Light signals prescribed by paragraph (4) may be surmounted by a cross of the size, colour and type shown in diagram 542.

32.—(1) Subject to the next following paragraph, a lens or lenses of the size and colour shown in diagram 3001 in Schedule 3, which, when illuminated, shows a green arrow—

(a) may be substituted for the lens showing the green light in the light signals referred to in Regulation 31(2) in any of the methods shown in diagrams 3003, 3005, 3006 and 3011 in the said Schedule;

(6) may be affixed to the light signals referred to in Regulation 37(2) or to those signals as altered in accordance with the preceding sub-paragraph in any of the methods shown in diagram 3002 and diagrams 3004 to 3011 in the said Schedule.