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DUAL CARRIAGEWAY ROADS
PRINCIPLES OF DESIGN FOR THE WORKS ZONE
Plan DZD1: Works zone for a full lane closure on a dual carriageway road with a permanent speed limit of 40 mph or less
The principles are:
- coning to Detail C1 is required;
- a sign indicating the number of lanes open to traffic (7205) with distance plate (7209) "For x miles" is required located on the off side at ½ mile intervals — these are not required for works for which relaxations apply; and
- where a temporary mandatory speed limit is in place, signs to diagram 670 should be continued from the lead-in zone; for the spacing of speed limit repeater signs, see Table 3.4, Note 1.
- If a section of the works zone is used purely for access then consideration should be given to placing a "keep left/right" sign (610) on the approach to any works area located after the access. The designer shall assess if additional 610 signs are needed where specific risks in the works zone or changes in road geometry would justify additional guidance to road users.
Similar signing is required for right-hand closures.
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- Not required where there is a relaxation.
Keys to the plans are given in Tables A1.4 and A.1.5 of Appendix 1.
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