D5.8.9 The use of "STOP/GO" signs as a method of traffic control is most appropriate in daylight hours and good visibility, see also O3.22.11. On high-speed single carriageway roads, the use of "STOP/GO" signs is not recommended at night. When "STOP/GO” signs are used at night, each sign face must be adequately illuminated by its own source of lighting; the use of reflectorised materials alone is not sufficient and does not comply with the statutory requirements.
D5.8.10 "STOP/GO” signs should not be used in conjunction with priority signs to diagrams 615 and 811.
D5.8.11 The recommended signing layout for this type of control is illustrated in Plan SC5 for a single two- lane carriageway road and in Plan SC6 for a single three-lane carriageway road.
D5.8.12 These principles are illustrated in Plans SC5 and 5C6.
The principles for advance signing are:
- a minimum of three advance signs are required:
- a "road works" sign (7001) on the near side only in both directions in advance of the works; a distance plate (572) is required for roads with a permanent speed limit of 50mph or more;
- a "TRAFFIC CONTROL AHEAD" sign (7010.1) on the near side only in both directions in advance of the works;
- on a two-lane single carriageway road (see Plan 5C5): a "road narrows" sign (517) with supplementary plate "Single file traffic" (518) on the near side only in both directions. On roads with a permanent speed limit of 50 mph or more, "for" and a distance are required on the diagram 518 plate;
- on a three-lane single carriageway road (see Plan 5C6) marked as two lanes in one direction and one in the other: a sign (7206) on the near side of the two-lane approach to indicate that the centre lane is closed, with traffic on the off side of the works travelling in the opposite direction
- for roads with a permanent speed limit of 40mph or less, one sign (7206) is required;
- for roads with a permanent speed limit of 50 mph or more, one sign (7206) is required with a bottom panel (7208) indicating the distance to the works of 200 yards, placed 200m in advance of the works, and a second sign is required with a bottom panel (7208) indicating the distance to the works of 100 yards, placed 100m in advance of the works;
- where the works consist of surface dressing and the new road surface is to be trafficked then the initial sign (7009) with maximum advisory speed plate (513.2) should replace the "road narrows" sign (517); in situations where both signs are required, the placing of the initial surface dressing warning signs should be far enough in advance of the loose chippings to give drivers adequate distance to slow down;
- on a two-lane single carriageway road: a "STOP/GO" board (7023/7024) 15m in advance of the start of the taper and, 15m in advance of the board, a "WHEN STOP SIGN SHOWS WAIT HERE" sign (7011 variant). In some cases this distance may need to be increased to avoid a waiting vehicle blocking the path of vehicles as they leave the works; and
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