Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/260

DUAL CARRIAGEWAY ROADS

The detailed principles and the signing required for changeovers from the hard shoulder are as shown in Plan DZE2.

The detailed principles and the signing required for the return crossover are as shown in Plans DZE3 and DZE5.

On three-lane carriageways where the secondary carriageway central reservation approach sign (7230) needs, for safety clearance purposes, to encroach into lane 3 of the primary carriageway the two-lane crossover returned traffic should be to lanes 1 and 2. Lane 3 should be coned off using Detail F to provide the necessary sign protection; see Plan DTF4.

Plan DTF7 illustrates an end-of-works zone for a tidal flow layout for a full contra-flow on a two-lane carriageway and Plan DTF8 illustrates a works zone for a tidal flow layout for a partial contra-flow on a three-lane carriageway.

Keys to the plans are given in Tables A14 and A1.5 of Appendix 1. 259