Page:UK Traffic Signs Manual - Chapter 4 - Warning Signs. 2013.pdf/60



Although prescribed mainly for temporary use to warn of transient or occasional hazards such as "Dust cloud" or "Census", diagram 562 is also used for certain permanent features not easily represented symbolically, e.g. "Hidden dip".

The sign conveys no specific message on its own, it must always be accompanied by one of the supplementary plates prescribed as diagram 563, 563.1, or 7022 when used at temporary traffic signal installations (see Chapter 8). Reference should always be made to the working drawings (see para 1.8) to determine the correct layout of the different legends.

When the legend on the sign to diagram 563 indicates the temporary hazards "Accident", "Census", "Dust cloud", "Fallen tree", "Frost damage", "Overhead cable repairs", "Runners in road", "Smoke" or "Walkers in road", the sign may be retained only for so long as the hazard indicated continues to exist or is expected to recur in the near future (direction 39(3)).

When diagram 563 is varied to "Pedestrians crossing", it may be used where pedestrians frequently cross high-speed roads, although no formal provision is made for them, and sited at a distance appropriate to the 85th percentile speed (see Appendix A). Such locations may be where new by-passes intersect established pedestrian routes. As the crossing point is unlikely to be apparent to drivers, a distance should normally be added, in accordance with the working drawing (see para 1.8). The sign must not be used where a formal crossing, such as a Zebra or Pelican crossing, is provided.

The sign to diagram 563.1, in combination with diagram 562, may be used only where wig-wag signals to diagram 3014 are installed in the vicinity of premises used regularly by fire, police or ambulance service vehicles. 59