Page:UK Traffic Signs Manual - Chapter 8 - Part 2- Traffic Safety Measures and Signs for Road Works and Temporary Situations) - Operations 2009.pdf/38

OPERATIONAL ISSUES Constraints on the timing of deliveries may need to be considered to ensure that materials can be safely delivered. Particular attention should also be given to the storage of materials that are hazardous to health.

In some circumstances works off the carriageway, as well as on the carriageway, may require vehicles to be parked on the carriageway (see paragraph O3.19.4).

The design aspects of works on minor roads are dealt with in Part 1: Design, Section D5.3.

For works on the carriageway where there are no parked vehicles in the vicinity of the works, and there is no works vehicle in attendance to afford protection, the following signs should be provided together with cones and pedestrian barriers as necessary:
 * "road works" signs to diagram 7001;
 * "keep left/right" signs to diagram 610;
 * "road narrows" signs to diagram 517; and
 * "lane closed" barriers to diagram 7105.

The presence of an occasional parked vehicle does not require different treatment.

For works on the carriageway with a works vehicle in attendance:
 * in the interests of safety, vehicles used at road works should be conspicuous, see Section ;
 * where a vehicle meeting the above requirements is parked within the coned-off area, the “lane closed” barrier to diagram 7105 need not be used; and
 * works vehicles and plant should not be parked in a position where they are likely to obstruct junctions, accesses or driveways.

Provided that all the following conditions are met:
 * the permanent speed limit is 30 mph or less, and
 * there is a total two-way traffic flow of less than 400 vehicles per hour, and
 * less than 20 heavy goods vehicles and buses pass the works site per hour then if a roof-mounted flashing amber beacon is continuously operating, and if the beacon is always clearly visible from a distance of at least 50 m on each approach, it will not be necessary to provide the "road works" signs to diagram 7001 or the "road narrows" sign to diagram 517 in advance of the works.

The "road works" sign to diagram 7001 should normally be placed 45 m in advance of the works, but this distance may have to be greater if the visibility of the sign is impaired by features of the road. However, in urban areas the sign may need to be placed closer where there are numerous side roads so that the sign does not become disassociated from the works. Sections D5.4 to D5.10 of Part 1: Design provide details of different methods of traffic control. 36