Page:UK Traffic Signs Manual - Chapter 3 Regulatory Signs. 2008 (Second Impression 2008).pdf/26

COMPULSARY AND PROHIBITED MOVEMENTS only a narrow refuge on the roundabout exit, and not a triangular splitter island, the "keep left" sign may be used. The sign should be used at the recommencement of a central reservation following a gap, as traffic turns right in front of the sign without actually passing it.

The sign may be varied to indicate "keep right"; this is sometimes used in permanent situations such as traffic calming schemes and also in association with road works.

The "pass either side" sign to diagram 611 is for use on traffic islands, usually situated in one-way roads, where drivers passing either side of the sign reach the same destination immediately beyond. It must not be used in situations where drivers would become committed to different destinations once they had passed the sign. In this case, a plain-faced bollard should normally be provided, although it might not be required where direction signs have been erected on the traffic island.

The sizes of 270 and 300 mm for signs to diagrams 610 and 611 are intended for use in bollards, although some bollards will accommodate larger sizes. Sizes of 450 mm and above are intended for use at higher level or for free-standing signs at road works (see Appendix A). Where a sign is mounted in a bollard, especially where the speed limit is greater than 30 mph, a larger post-mounted sign may also be provided at the same location to give greater emphasis.

The sign to diagram 615 indicates that drivers must give priority to vehicles from the opposite direction on a narrow length of road. It should be used only when vehicles at each end of the priority section are clearly visible to each other and speeds are not high. The sign must not be displayed to traffic approaching from both directions. It must never be used upside down in an attempt to imply reversed priority. The sign must always be accompanied by the supplementary plate to diagram 615.1 (Give way to oncoming vehicles) at the start of the priority section.

The sign to diagram 811, together with the plate to diagram 811.1 (Priority over oncoming vehicles) must be mounted to face traffic approaching from the other direction. As with diagram 615 above, this sign must never be used upside down in an attempt to imply reversed priority.

Unless the limits of the priority section are obvious, e.g. through the arch of a bridge, the plates to diagram 615.1 and 811.1 should be varied to include the distance over which the priority applies,