SINGLE CARRIAGEWAY ROADS
- a "lane closed" barrier (71 05) with a "keep left/right” sign (610) is placed at the end of the taper behind the cones; the "keep left/right” sign may be placed behind or in front of the barrier; and
- on a three-lane single carriageway road; when two lanes are crossed, one "lane closed" barrier (7105) with a high intensity warning light and a "keep left/right” sign (610) is placed in the closed lane.
The principles for the works zone are:
- coning to Detail C1 is used to mark the edge of the works area on single carriageway roads; no additional signing is required.
The principles for the exit taper are:
- coning on two-lane single carriageway roads to Detail B at 45° to the edge of the road;
- the coning for the exit taper on three-lane single carriageway roads is the same as for the lead-in taper; and
- a "lane closed" barrier (7105) facing opposing traffic with a "keep left/right” sign (610); on a three-lane single carriageway road these signs are positioned on the central traffic control island.
The principles for the end of the road works are:
- a "road works" sign (7001) with supplementary plate "End" (645) is located a distance E from the end of the works; see Table 5.3 in Section D5.4.
Placing of signals:
- on a two-lane single carriageway road: as per paragraph D5.10.7;
- on a three-lane single carriageway road: on the two-lane side, a portable traffic signal is placed on the near side opposite the end of the lead guide island; on the single-lane side, a portable traffic sign is placed midway along the taper behind the cones.
Guide islands:
- Principles for guide islands are given in Section D5.11.
High intensity warning lights are not required where there is positive traffic control ("STOP/GO" signs, portable signals) but are required for priority signs during the hours of darkness where there is a loss of one lane or part of a lane.
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