Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/96

 NOTES:
 * 1) Classes, categories, luminance factors etc. refer to those given in BS EN 13422z2004. "Vertical road signs. Portable deformable warning devices and delineators. Portable road traffic signs. Cones and cylinders."
 * 2) Cones and cylinders shall be tested to and meet the requirements of BS EN 134222004 for the category and classes given above.

The detailed design of signs for lane restrictions and lane changes is shown on the working drawings (see paragraph D1.2.2) or dealt with in Section 13 of Chapter 7. The principles for using these signs are described in Section D5 for single carriageway roads and Section D6 for dual carriageway roads.

Wicket signs such as those illustrated in paragraphs D4.10.5 to D4.10.10 and variants, should only be used on dual carriageway roads.

The following signs are used to indicate lanes open or closed to traffic and contra-flow working.

The centre lane of a three-lane single carriageway road is closed with traffic on the off side of the works travelling in the opposite direction.

The two right-hand lanes of a four-lane dual carriageway are closed to traffic ahead. On this and the following signs the number of arrows indicating which lines are open or closed to traffic may be varied. 95