Regulation 14 Signs attached to vehicles
A sign attached to a vehicle of the description and in the position on that vehicle specified in an item in column (2) of the Table, when the vehicle is on a road which is subject to a maximum speed limit specified in column (3) of that item, shall be of the size, colour and type shown in one of the diagrams specified in column (4) of that item.
Table
| (1) | (2) | (3) | (4) |
|---|---|---|---|
| Item | Description of vehicle, and position | Maximum speed limit | Diagram numbers |
| 1. | Road maintenance vehicle, on the front | 30 mph or under | 610, 7001 and 7001.1 |
| 2. | Road maintenance vehicle, on the rear | 30 mph or under | 610, 7001, 7001.1, 7401, 7401.1, 7402, 7403 and 7404 |
| 3. | Road maintenance vehicle, on the rear | More than 30 mph | 7401, 7401.1, 7402, 7403 and 7404 |
| 4. | Police vehicle, on the front or the rear | 70 mph or under | 829.1, 829.2, 829.3 and 829.4 |
The operating requirements for the lamps that form part of the signs shown in diagrams 7401, 7402 and 7403 are that—
the lamps shall be illuminated only when the signs are being used in accordance with the Table; and
each lamp shall show an intermittent amber 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 lights of one horizontal pair are always shown when the lights of the other horizontal pair are not shown.