SINGLE CARRIAGEWAY ROADS
PRIORITY SIGNS — PRINCIPLES FOR TWO-LANE SINGLE CARRIAGEWAY ROADS
D5.7.7 These principles are illustrated in Plan SC4.
The principles for the advance signing are:
- three advance signs are required:
- a "road works" sign (7001) on the near side only in both directions; a distance plate (572) is required for roads with a permanent maximum speed limit of 50mph or more;
- 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 a site specific risk assessment should be used to decide whether "for" and a distance should be included on the diagram 518 plate; and
- priority signs (811 in the priority direction and 615 in the "give way" direction, with explanatory plates 811.1 and 615.1 respectively) on the near side only; "for" and a distance may be incorporated these signs.
The principles for the lead-in taper are:
- one "keep left/right" sign (610) on the near side at the start of the taper;
- coning to Detail B at an angle of 45° to the edge of the road; and
- a "lane closed" barrier (7105) with a "keep left/right" sign (610) at the end of the taper.
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 to Detail B at 45° to the carriageway (the coning for the exit taper may be the same as for the lead-in taper at some works); and
- a "lane closed" barrier (7105) facing opposing traffic with a "keep left/right" sign (610).
The principles for signing at 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 D54. When the length of the single file lane is less than 50m, this sign is not required.
Relaxations: There are no relaxations when priority signs are used.
High intensity warning lights are required during the hours of darkness where there is a loss of one lane, or part of a lane:
- high intensity warning lights are not required where there are "STOP/GO" signs or temporary 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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