Plan MLC1: Mobile Lane Closure on a dual carriageway road without a hard shoulder
Three vehicle or trailer-mounted signs are required on the near side, off the carriageway, up to one kilometre from the initial block vehicle that is positioned in the carriageway:
- initial two (or more) signs to diagram 7402 showing supplementary plate "Ahead";
- final advance sign to diagram 7402 with no supplementary plate; and
- one block vehicle B carrying a light arrow sign (or sign to diagram 7403) 50 m – 100 m in advance of the working vehicle A carrying sign to diagram 7403.
Vehicles C, D and E should preferably be evenly spaced with a spacing no closer than 200 m or greater than 350 m. These vehicles will move from their current positions to the next available hard standing as the work progresses whilst maintaining an overall distance of no more than one kilometre from vehicle B. Advance sign vehicles should be positioned so that approaching drivers are able to see, at any instant, at least two consecutive signs; see paragraph O10.14.5.
If, in extreme circumstances, suitable stopping points are not available for all three advance warning vehicles then Vehicle D may be omitted. This decision should be based on a site specific risk assessment. Vehicle D should always be used unless there are very sound reasons not to do so. For a closure of the middle lane on a three lane dual carriageway road without a hard shoulder, the advance signs should be as Plan MLC1 and the position of the block vehicles and working vehicle should be as Plan MLC3 or MLC5.
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