DUAL CARRIAGEWAY ROADS
Plan DZC3: Lead-in zone for a two-lane changeover
Guidance on the design of the changeover is given in Section D6.6.
Principles for the guide island are given in Plan DZC2.
Principles for the changeover are as follows:
- a "diversion of lanes" sign (7237) is located on the near side at the start of the changeover;
- 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 verge, a footway or a hard shoulder, 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 E is used on the near side;
- coning to Detail F is used on the off side;
- lane markings to Detail J are used between the two lanes; 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.
No relaxations apply.
Where the hard shoulder is not used for a works entry, and works access signs are not in place, an additional Detail A should be placed at the start of the coning blocking the hard shoulder.
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