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DUAL CARRIAGEWAY ROADS
Plan DZB5: Lane-change zone for a single lane closure on a dual carriageway road with a permanent speed limit of 50 mph or 60 mph
Three pairs of advance signs are required at 200 yard intervals:
- wicket signs indicating the closed lane (7202) with distance panel "600 yards" (7208) on the near side and the off side, placed 600 m in advance of the works lead taper; and
- the wicket signs with appropriate distance panel (400 yards and 200 yards) are placed at 400 m and 200 m in advance of the works lead taper.
For entry taper details, including relaxations, see Plan DZB2.
Where a speed limit lower than the permanent speed limit is required, signs to diagram 670 should be placed as shown on Plan DZB6.
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Keys to the plans are given in Tables A1.4 and [[../../A1#table1.5|A1.5]] of Appendix 1.
NOTE: Where no hard shoulder is present, no signing to Detail A is required.
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