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DUAL CARRIAGEWAY ROADS
Plan DZB4: Lane-change zone for a single lane closure on a dual carriageway road with a permanent speed limit of 40mph or less
Two pairs of advance signs are required at 100m intervals:
- wicket signs indicating the closed lane (7202) with distance panel "200 yards" (7208) on the near side and the off side, placed 200m in advance of the works lead taper; and
- the wicket signs with distance plate "100 yards" are repeated 100m in advance of the works lead taper.
For entry taper details, including relaxations, see Plan DZB1.
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Keys to the plans are given in Tables A1.4 and A1.5 of Appendix 1.
NOTES:
- Where no hard shoulder is present, no signing to Detail A is required.
- On roads with a permanent speed limit of 30 mph, the distance plates may be omitted.
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