DUAL CARRIAGEWAY ROADS
Plan DZC4: Lead-in zone for a single-lane changeover onto the hard shoulder
Guidance on the design of the changeover is given in Section D6.6.
The principles for moving a lane to the hard shoulder are as follows:
- the minimum signing requirement is the "use hard shoulder" sign (7230) with the top panel "USE HARD SHOULDER" (7260) at the start of the changeover in advance of the coning; the "use hard shoulder" sign (7230) with the bottom panel "200yds" (7271) placed 200m in advance of the start of the changeover should also be considered;
- one "keep left/right" sign (610) at the start of the changeover; if this is placed in a closed lane, as opposed to a normally non-trafficked area such as the central reservation, then a "lane closed" barrier (7105) with a high intensity warning light should be added;
- one "lane closed" barrier (7105) with a high intensity warning light and a "keep left/right" sign (610) at the end of the changeover;
- one "lane closed" barrier (7105) with a high intensity warning light and a "keep left/right" sign (610) at the end of each lane crossed;
- coning to Detail F is used on the near side;
- coning to Detail E is used on the off side;
- signing to Detail A is used on the hard shoulder at the start of the lane move in advance of the coning; and
- where a temporary mandatory speed limit is 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.
For signs where the lanes are split in advance of the hard shoulder running, between hard shoulder and secondary carriageway, see Plan DZC9.
The principles for works for which relaxations apply are as for standard works except:
- coning to Detail C1 is used on the near side;
- coning to Detail B is used on the off side; and
- following a risk assessment the hard shoulder/lane 1 raised rib marking may be retained at the changeover
194
