Road danger lamps
55.—(1) A lamp showing a steady or intermittent amber light which—
(a)conforms to—
(i)British Standard Specification BS3143: Part 1: 1985 amended by Amendment No. 1 dated February 1985;
(ii)BS3143: Part 2: 1990 amended by Amendment No. 1 dated November 1993 and Amendment No. 2 dated December 1998; or
(iii)a corresponding EEA Standard; and
(b)is illuminated separately and by a single source of light,
shall indicate to traffic the limits of a temporary obstruction of the road and in this regulation is called a “road danger lamp”.
(2) The height of the centre of each lens of a road danger lamp from the surface of the road in the immediate vicinity of the lamp shall not exceed 1500 millimetres where the speed limit on the road is 40 mph or less, or 1200 millimetres where the speed limit on the road is more than 40 mph.
(3) The rate of flashing of a road danger lamp which shows an intermittent light shall be—
(a)if the lamp is placed not less than 50 metres from a street lamp lit by electricity on a road subject to a speed limit of 40 mph or less, either—
(i)not less than 900 flashes per minute; or
(ii)not less than 55 nor more than 150 flashes per minute;
(b)in any other case not less than 900 flashes per minute.