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DUAL CARRIAGEWAY ROADS
WORKS ZONE
D6.29.19 The principles for the works area are as follows:
- to mark the contra-flow running lanes:
- cylinders and studs to Detail K,
- in the primary direction, a sign indicating open and contra-flow lanes (7203) with distance plate "For x miles" (7209) placed on the near side and repeated at ½ mile intervals through the contra-flow, and
- in the secondary direction, a sign indicating hard shoulder, open and contra-flow lanes (7203.1) with supplementary plate "For x miles" (7209) placed on the near side and repeated at ½ mile intervals through the contra-flow.
D6.29.20 Plan DTF5 illustrates a works zone for a tidal flow layout for a full contra-flow on a two-lane carriageway and Plan DTF6 illustrates a works zone for a tidal flow layout for a partial contra-flow on a three-lane carriageway.
Plan DTF5: Tidal flow layout, works zone for full contra-flow on a two-lane carriageway road
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Keys to the plans are given in Tables A1.4 and 1.5 of Appendix 1.
NOTE: All cone gates are shown in position for "Condition 1+2". Positions for "Condition 2+1" are shown dotted.
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