Page:UK Traffic Signs Manual - Chapter 8 - Part 2- Traffic Safety Measures and Signs for Road Works and Temporary Situations) - Operations 2009.pdf/150

MOBILE CARRIAGEWAY CLOSURE TECHNIQUES *The monitor vehicle should remain in a safe location off the carriageway while the traffic counts are being taken prior to the closure.
 * The use of a hard shoulder vehicle referred to in this document will obviously not be appropriate.

Closure vehicles in live traffic lanes should be capable of displaying both a red cross with red lanterns flashing in the same format as diagram 6031.1 and an amber light arrow in accordance with the upper portion of the sign described in Section O10.8. The basic design of the whole sign is shown in Figure 11.1. This arrangement is not prescribed; only signs which have the appropriate sign authorisation and type approval may be used.

In accordance with TSRGD regulation 37, the four corner red lamps must flash in alternate vertical pairs. The red cross must be illuminated by a steady light.

There are two ways in which the red cross may be formed:
 * individual lamps (diameter 200 mm); or
 * as part of a VMS panel.

The lamp layout shown is indicative, for details of the precise number and layout of lamps refer to the relevant special signs authorisation.

Whichever option is used, the form of the red cross on all the closure vehicles should be the same.

The lower panel shows a sign with the legend "CONVOY VEHICLE NO OVERTAKING", to diagram 7029. See Figure 11.1. A more flexible alternative to this sign on the lower panel is a VMS sign which, in this application, should display the same "CONVOY VEHICLE NO OVERTAKING" legend. The lower panel should be reflectorised using the same material as the sign to diagram 7403 (see paragraph O10.7.4). 148