The Traffic Signs Regulations and General Directions 1994

Road danger lamps

43.—(1) A lamp showing a steady or intermittent amber light which—

(a) conforms to British Standard Specification BS3143: Part 1: 1985 amended by Amendment No.1 dated February 1985; or BS3143: Part 2: 1990; or an equivalent specification of a European Economic Area State; 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 miles per hour or less, or 1200 millimetres where the speed limit on the road is more than 40 miles per hour.

(3) Where a road danger lamp which shows an intermittent light is placed—

(a) within 50 metres of a street lamp lit by electricity on a road subject to a speed limit of 40 miles per hour or less, the lamp shall operate in such a way that the rate of flashing shall be not less than 40 nor more than 150 flashes per minute; and

(b) on roads other than those mentioned in sub-paragraph (a), the rate of flashing shall be not less than 900 flashes per minute.