Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/189

DUAL CARRIAGEWAY ROADS

The lead-in zone starts at the point at which all lane changes, if required, should have been completed and continues to the beginning of the longitudinal safety zone.

List of plans:

Plan DZC1 Lead-in zone for a single-lane changeover on a dual carriageway road with a permanent speed limit of 40 mph or less

Plan DZC2 Lead-in zone for a single-lane changeover on a high-speed dual carriageway road

Plan DZC3 Lead-in zone for a two-lane changeover

Plan DZC4 Lead-in zone for a single-lane changeover onto the hard shoulder

Plan DZC5 Lead-in zone for a two-lane changeover with narrow lanes using the hard shoulder

Plan DZC6 Lead-in zone for a single-lane crossover

Plan DZC7 Lead-in zone for a two-lane crossover

Plan DZC8 Lead-in zone for a three-lane crossover with narrow lanes

Plan DZC9 Lead-in zone for splitting lanes for a changeover onto the hard shoulder and a single-lane crossover

Guidance on the design of the changeover is given in Section D6.6.

Principles for the guide island are: Principles for the guide island for which relaxations apply are as for standard works except: Principles for the changeover are: 188
 * coning to Detail F is used to guide traffic past the island — if existing carriageway markings are suitably located and in good condition then Detail C1 may be used, and
 * the length of the guide island, excluding tapers, is 100 m.
 * coning to Detail C1 is used to guide traffic past the island.
 * straight “taper” or smooth ’5’ shaped curve layout; length of changeover as detailed in Table 6.6,
 * coning to 9 m spacing either side of the changeover (Detail C1 — see Table A1.5 (Appendix 1));