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DUAL CARRIAGEWAY ROADS
PRINCIPLES OF DESIGN FOR THE LANE-CHANGE ZONE
Plan DZB1: Entry taper for a dual carriageway road with a permanent speed limit of 40 mph or less Principles for entry tapers are:
- length of taper is 100 m/lane closed;
- coning to 3 m spacing, Detail C2 — see Table A1.5 (Appendix 1);
- one "keep left/right” sign (610) at the start of the taper;
- one "lane closed" barrier (7105) with a high intensity warning light and a "keep left/right” sign (610) at the end of each closed lane of the taper; and
- one "lane closed" barrier (7105) with a high intensity warning light midway along the length of each closed lane of the taper.
Principles for entry tapers for works for which relaxations apply are as for standard works except:
- the "lane closed" barrier (7105) with a high intensity warning light midway along the length of each closed lane of the taper may be omitted.
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| Standard | Relaxation | ||||||
| Keys to the plans are given in Tables [[Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/A1#table1.4|A1.4 and A1.5 of Appendix 1. | |||||||
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