DUAL CARRIAGEWAY ROADS
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 crossover and changeover is given in Sections D6.5 and D6.6.
The principles for splitting lanes are as follows:
- studs and cylinders, or studs and road markings, to Detail G for a minimum length of 100m up to the "nose" of the divide — there are two options:
- using studs and traffic cylinders — a minimum of 50m of Detail G2 followed by a minimum of 50m of Detail G1; or
- using studs and road markings — a minimum of 100m of Detail G3;
- a "diversion of right-hand lane onto the other carriageway" sign (7212) with "GET IN LANE" top panel (7262) and a "200yds" bottom panel (7271) is located on both sides of the carriageway 200m from the start of Detail G — the signs to diagram 7212 can include an indication of a motorway exit if appropriate;
- a "diversion of right-hand lane onto the other carriageway" sign (7212) with "STAY IN LANE" top panel (7263) and a “NOW” bottom panel (7272) is located on both sides of the carriageway at the start of Detail G — the signs to diagram 7212 can include an indication of a motorway exit if appropriate;
- a "diversion onto the other carriageway" sign (7210) is located on the off side at the start of the crossover;
- a "use hard shoulder" sign (7230) with a "USE HARD SHOULDER" top panel (7260) is located on the near side at the start of the changeover onto the hard shoulder; and
- a temporary mandatory speed limit will be in place; signs to diagram 670 should be continued from the lane-change zone; for the spacing of speed limit repeater signs, see Table 3.4, Note 1.
The principles for the changeover to the hard shoulder are given in Plan DZC4.
The principles for a single-lane crossover are given in Plan DZC6.
No relaxations apply.
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