Page:UK Traffic Signs Manual - Chapter 8 - Part 2- Traffic Safety Measures and Signs for Road Works and Temporary Situations) - Operations 2009.pdf/158

MOBILE CARRIAGEWAY CLOSURE TECHNIQUES

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NOTE: HS – In Northern Ireland, the hard shoulder vehicle specification is to be the same as for the lane closure vehicles.

The monitor vehicle at the rear of the group of vehicles moving away in front of the closure should monitor the speed of these vehicles. The supervisor should be informed if the speed of this group falls below 50 mph since the duration of the working window relies on the speed differential between the closure and this group of vehicles. In such circumstances, the supervisor should consider reducing the speed of the closure (but not to less than 20 mph), in order to achieve the designed closure window. See also reference to the creation of an emergency situation in paragraph O11.14.2 below.

The monitor vehicle will be travelling behind the last of the traffic in front of the closure and when it has passed the proposed working area (Plan MCC1b), the driver should inform the supervisor of his position and the supervisor will inform the foreman responsible for activities in the working area, and work on the carriageway can commence in a traffic-free environment. 156