Plan DZD3: Works zone showing a buffer lane
The principles for marking the running lanes on the primary carriageway alongside the works area are:
- coning to Detail F is used — if existing carriageway markings are suitably located and in good condition then Detail C1 may be used; and
- a sign indicating the number of lanes open to traffic (7205) with distance plate (7209) is required — this combination is repeated every 1/2 mile on the near side of the carriageway.
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.
The principles for marking the running lanes on the secondary carriageway are:
- for a running lane adjacent to a buffer lane, coning to Detail C1 is used placed inside the existing road marking — where existing road markings are not suitable coning to Detail F is used. Signs to diagram 7203 are not used;
- a sign indicating the number of lanes open to traffic (7205) with distance plate (7209) is required; this combination is repeated every 1/2 mile on the central reservation for vehicles required to cross over and use the secondary carriageway; and
- in the secondary direction a sign indicating the number of lanes open to traffic, one of which uses the hard shoulder (7204) with distance plate (7209) is required; this combination is repeated every ½ mile on the near side.
A temporary mandatory speed limit will be 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.
For works for which relaxations apply, the principles are as for standard works except:
- coning to Detail F may be replaced by coning to Detail C1 or D — the cone spacing depends on the permanent speed limit — see Table A1.3 (Appendix 1).
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Keys to the plans are given in Tables A1.4 and A1.5 of Appendix 1.
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