Page:UK Traffic Signs Manual - Chapter 3 Regulatory Signs. 2008 (Second Impression 2008).pdf/127

 {{ts|mc}} placed only in an area or along a route where enforcement cameras are from time to time in use. The sign to diagram 879 is a reminder that camera enforcement is taking place, and may be used more frequently than the sign to diagram 878. It is often co—located with a speed limit sign (see para 14.43).

14.41 The size of the sign to diagram 878 is related to the speed of traffic and is specified in Appendix A. The size of the sign to diagram 879 will depend on whether or not it is co—located with a speed limit sign to either diagram 670 or 671. Where it is mounted on its own, the height of the sign should not be less than the size of the speed limit repeater signs as specified in table 14.4|14-4. On lit 30mph roads, the 300 mm size should be used. Where diagram 879 is co—located with diagram 670 or 671, the size of the sign should be as shown in figure 14-20.

14.42 Where camera enforcement utilises two cameras to measure the average speed of a vehicle over a set distance, the sign shown in figure 14-21 may be used. Although based on diagram 878, the sign is not prescribed by the Regulations. It is shown on working drawing NP878.1 (available from the Department) and requires authorisation (see para 2.1). The size of the sign will be the same as specified for diagram 878 in Appendix A.

Figure 14-21 Indication that cameras are used to measure the average speed of a vehicle along a length of road (alternative types)

This sign is not prescribed by the Regulations and requires authorisation 125