1. A lamp for conveying to traffic the limits of a temporary obstruction of the road (“a warning light”) must comply with the requirements in paragraphs 2 to 6.
2. The height of the centre of each lens of the warning light from the surface of the road in the immediate vicinity of the lamp must not exceed—
(a)1500 mm where the speed limit on the road is 40 mph or less; or
(b)1200 mm where the speed limit on the road is more than 40 mph.
3. The warning light must—
(a)be powered separately from any other object or device; and
(b)show a steady or intermittent amber light.
4. Subject to paragraphs 5 and 6, the whole of the warning light must conform to British Standard BS EN 12352:2006(1).
5. In relation to each aspect of performance specified in column (2) of an item in the Table below, the warning light must comply the requirement or test specification of British Standard BS EN 12352:2006 specified in column (3).
(1) Item | (2) Aspect of performance | (3) Requirement or test specification and class |
|---|---|---|
| 1 | Area, angle and luminous intensity | Class L1 or L3 in Table 1 |
| 2 | Light emitting surface | For class L1 lights: paragraph 4.1.2.1 For class L3 lights: class P1 |
| 3 | Colorimetric performance of light emitted | Class C yellow 1 in Table 2 |
| 4 | Retro-reflective device | Class R2 |
| 5 | Automatic photosensitive switching | Class A1 |
| 6 | Continuity of emitted light | Class F1 (steady) or class F2 (but see NOTE) |
| 7 | On-time (flashing lights) | Class O2 |
| 8 | Mechanical strength | Class M4 |
NOTE: A light flashing at a rate of 900 flashes per minute or more is deemed to comply with class F1.
6. The external surface of the parts of the warning light which are not the lenses and are visible to road users must be of a colour having the colorimetric values of reference 355 Lemon, or reference 356 Golden yellow, in Table 1 (standard colours) of British Standard BS 381C:1996(2).
7. A person that, but for this paragraph, is not authorised to place a warning light is authorised to do so for the purpose of warning traffic of a temporary obstruction in the road, other than one caused by the carrying out of works.
8. General Direction 15 of the Schedule 13 General Directions applies to a warning light.
Publication date 31st May 2006 (ISBN 9780580687884); corrigenda, July 2008, July 2009 and October 2010.
Publication date 15th December 1996 (ISBN 0580267776).