Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/46

 *imposition of site speed limits;
 * access to works from adjoining network;
 * conflict with local land-use patterns and timing of works;
 * the need to eliminate as far as possible mud and debris left on road surfaces;
 * consultation with adjoining highway authorities;
 * possible need for heavy/light vehicles to follow different routes/arrangements from those for heavy/wide/high loads; and
 * impact on local businesses.

It may be necessary to provide traffic signal control when contractors’ vehicles, site equipment or materials need to be moved across a public highway between sites or within a site. The haul route traffic should approach the public highway in a defined line and on a level gradient. Priority should be given to the public highway, not to the haul route.

The need for traffic signal control should be considered at the design stage of a contract. The Highway Authority should be contacted for advice and for arranging site approval when a contract is let. It may be advisable to relocate the proposed crossing if approach visibility is reduced by a bend or other obstruction. If the crossing is not signal-controlled, the variant of diagram 511 "HEAVY PLANT CROSSING" should be placed in advance of the crossing place (see paragraph D3.23.5).

All equipment used to control traffic signs or signals must be of a type that has been approved for haul route use. This is generally referred to as "type approved". The Overseeing Organisation administers type approval and can advise the approval status of equipment if it is in doubt.

The general standard of layout and installation practice must be that associated with normal junction signals.

The "road works" sign to diagram 7001, the "crossroads ahead" sign to diagram 504.1 and the "traffic signals ahead" sign to diagram 543 are required on the public highway approaches to a haul route crossing. The "crossroads ahead" sign to diagram 504.1 is used in conjunction with a supplementary plate "HEAVY PLANT CROSSING" to diagram 511. Additional signs as appropriate may be required.

A plate to diagram 543.1 with the legend "Part time signals" should be fixed to each signal pole and also beneath the "traffic signals ahead" sign to diagram 543 in each case.

Where a stop line to diagram 1001 is provided and carriageway markings do not exist, lane and/or centre line road markings are required for a distance of at least 50m in advance of the stop line. Road marking are not required where a stop board to diagram 7011 is used in place of the stop line to diagram 1001.

If required, posts or markers coloured yellow may be implanted to demarcate the corners of the haul route crossing and to make the site corners more conspicuous, and hence more readily identifiable by drivers.

The recommended sequence of signing for each approach is shown in Figure 3.4. 45