Page:UK Traffic Signs Manual - Chapter 8 - Part 2- Traffic Safety Measures and Signs for Road Works and Temporary Situations) - Operations 2009.pdf/152

MOBILE CARRIAGEWAY CLOSURE TECHNIQUES

NOTES:
 * 1) This sign requires authorisation by the Secretary of State.
 * 2) The upper panel of the sign is the light arrow sign (see Section O10.8) with the two top flashing amber strobe lamps only illuminated.
 * 3) A means of obscuring the sign remotely from the driver’s cab should be fitted to cover and uncover the lower sign to diagram 7029.
 * 4) The sign to diagram 7029 must be reflectorised in accordance with the relevant special signs authorisation.
 * 5) The lower panel should be reflectorised using the same material as the sign to diagram 7403 (see paragraph O10.7.4).

Comprehensive signing is required to inform road users to the rear of the convoy that there is slow moving traffic ahead. Where it is available, full use of existing permanent variable message signs (VMS) and matrix signals in the central reservation is necessary. The location of such signs should be determined at an early stage of the planning of the closure and arrangements made with the appropriate control office for full use to be made of this signing. See Section O11.20.

Gantry-mounted signals to diagram 6021 and post-mounted signals to diagram 6022 on the central reservation should show "50 mph". VMS signs that are capable of displaying a legend should show "QUEUE SLOW DOWN".

Upstream traffic should be warned by these signals of the presence of a traffic queue by at least two VMS signs. If permanent signs/signals are not available to provide this level of warning, at least two vehicle mounted signs warning of queues ahead should be positioned on the hard shoulder or verge as appropriate. These signs are not prescribed for use on vehicles and require authorisation by the Overseeing Organisation. See Plan MCC5 and Figure 11.3. 150