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DUAL CARRIAGEWAY ROADS
Plan DZB10: Lane-change zone for a narrow lane layout with no lane closures on a dual carriageway road for which the national speed limit applies
Three pairs of advance signs are required:
- 600 and 400 yards signs: the "restrictions ahead" sign (7201) is used incorporating symbols 7281 and 7283 or 7283.1, with a top panel "GET IN LANE" (7262) and a bottom panel "600/400 yards" (7271) on the near side and off side, placed 600m and 400m in advance of the works; and
- 200 yards sign: the "narrow lanes" sign (7235) is used incorporating symbols 7281 and 7283 or 7283.1, with a top panel "NARROW LANES" (7264), or if the hard shoulder is to be used "USE HARD SHOULDER" (7260) and a bottom panel "200 yards" (7271) on the near side and off side placed 200 m in advance of the works. If the hard shoulder is to be used then this sign is replaced by the "move to the hard shoulder" sign (7230) incorporating symbols 7281 and 7283 or 7238.1.
Where a temporary mandatory speed limit is in place, one pair of temporary speed limit signs is required, followed by repeater signs:
- the temporary speed limit sign (670), which will generally be 50mph, is to be placed on the near side and on the central reservation 50m in advance of the first sign indicating lane closures or restrictions (e.g. signs to diagram 7201, 7202, 7201.1), and
- for a temporary speed limit of 50mph the distance between successive signs on the same side of the carriageway should not exceed 700m, with a maximum of 450m between consecutive repeater signs on alternate sides of the carriageway. For temporary mandatory speed limits of 40mph or less, see Table 3.4, Note 1.
For narrowing the lanes:
- the length of the taper will depend on the rate of taper, see Table A1.3 (Appendix 1), and the width of the restriction;
- one "keep left/right” sign (610) at the start of the narrowing,
- one "lane closed" barrier (7105) with a high intensity warning light and a "keep left/right" sign (610) at the end of the narrowing,
- fortapers of 100m or greater, additional "lane closed" barriers (71 05)with high intensity warning lights are required at 50m spacing,
- coning to 1.5m spacing with marking to Detail E, see Table A1.5 (Appendix 1);
- signing to Detail A located on the hard shoulder opposite the "keep left/right” sign (610) at the start of the narrowing and also at the end of the narrowing, and
- white lining or temporary studs to Detail J used as road markings between lanes from the start of the narrowing.
No relaxations apply.
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