Page:UK Traffic Signs Manual - Chapter 3 Regulatory Signs. 2008 (Second Impression 2008).pdf/128

SPEED LIMITS On a lit road with a 30 mph speed limit, 30 mph repeater signs are not permitted (see para 14.21). However, the sign to diagram 880 may be used to advise drivers that a 30 mph speed limit is being enforced by cameras on roads that do not have repeater signs. This sign must not be used as a substitute for repeater or terminal signs, or to indicate any other limit. Direction 32(4) (introduced by the Traffic Signs (Amendment) Regulations and General Directions 2008) permits up to two signs to diagram 880 to be placed on any approach to an enforcement camera. For other speed limits, a repeater sign to diagram 670 may be co-located with the camera sign to diagram 879 as shown in figure 14-20, especially on the approach to an enforcement camera.

Where a camera is used to enforce the national speed limit on an unlit road, the sign to diagram 880.1 (introduced by the Traffic Signs (Amendment) Regulations and General Directions 2008) may be used. Direction 32(4) permits up to two signs to be placed on any approach to an enforcement camera. The sign to diagram 880.1 must not be used where there is a system of carriageway lighting (direction 32(3)): repeater signs to diagram 671 should be used, co-located with diagram 879 as appropriate (see figure 14-20).

Only one size of sign is prescribed for diagram 880, as it is only ever used on a road with a 30 mph speed limit. The sign to diagram 880.1 has two sizes; the smaller size is for single carriageway roads and the larger size for dual carriageway roads.

Speed enforcement should be highly visible, with drivers made fully aware of the presence of cameras and of the prevailing speed limit. The camera and speed limit signs should always be clearly visible to drivers, and not obscured by other street furniture or vegetation. The minimum clear visibility distance for the signs, including diagrams 879 and 880, should be at least that shown in table 14-4. Speed limit repeaters and camera signs should be co-located where permitted and practicable (see para 14.43 and figure 14-20). For fixed cameras, the speed limit and camera signs should be visible to the driver in the same view as the camera. This may require additional speed limit repeater signs where the spacings shown in table 14-4 do not coincide with camera locations (see directions 11(6) and 11(7), as introduced by the Traffic Signs (Amendment) Regulations and General Directions 2008).

Where temporary speed limits are provided in connection with road works, signing should be in accordance with Chapter 8. Any reference in Chapter 8 to Traffic Advisory Leaflet 1/95 (now withdrawn) shall be taken as a reference to this chapter. The sign shown in diagram 7290 (mandatory speed limit ahead) must not be used to indicate a permanent speed limit (direction 36).

Signs indicating the maximum speed advised must not be used to indicate a mandatory speed limit. Use of the supplementary plate to diagram 513.2 is detailed in Chapter 4 (para 3.10) and in Chapter 8 (in combination with the "loose chippings" warning sign to diagram 7009). See Chapter 8 also for the maximum speed advised signs shown in diagrams 7275 and 7294. 126