O8.1.11 Plan SVW1 is the basic layout and may be used if, following a risk assessment, it is not considered necessary to use traffic control by means of manually operated "STOP/GO" boards.
O8.1.12 Plan SVW2 shows an example of a traffic management plan for single vehicle works on single carriageways using traffic control. Such arrangements should be used when forward visibility is limited to less than 150 metres or site circumstances require traffic control.
O8.1.13 When traffic control is used, the “road works” sign (7001) with supplementary plate "Mobile road works" (7001.1) should be repeated at approximately 400 m intervals. Additional signs may be required to suit the carriageway alignment and at junctions.
O8.1.14 When traffic control is used, the "STOP/GO" board operatives shall be equipped with two-way radios.
O8.1.15 The systems illustrated in Plans SVW1 and SVW2 are only to be operated on two-lane single carriageways, and when the two-way flow past the site is less than 1300 vehicles per hour. The system shown in Plan SVW2 is only to be operated in daylight.
O8.1.16 Where the road alignment is good and congestion is unlikely to occur and on single carriageway roads where adequate remaining width for two-way traffic is available (see Part 1: Design, Section D3.2), advance warning signs may be unnecessary provided the vehicle is adequately marked; see Section O5.2.
O8.1.17 When working in the vicinity of junctions or roundabouts where approaching vehicles are not able to see the rear-mounted signing, or rear illumination is ineffective due to the angle of approach, the works and/or signing vehicles should have their flashing amber warning beacons switched on and approach signing to the junction placed as appropriate.
O8.1.18 When it is necessary to work across junctions, a static "road works" sign to diagram 7001 should be displayed to traffic on the side road. Signs will not be required at minor junctions and accesses providing there is good visibility for drivers emerging from the junction.
O8.1.19 Where mobile works are carried out in the nearside or offside lane of an urban dual carriageway where the permanent speed limit is 40 mph or less, it may be impracticable to locate the advance vehicle mounted signs (see also O8.1.1) and the requirements of Section O10 may be inappropriate. In this case, advance warning should be given by "road works" signs to diagram 7001, with a supplementary plate variant to diagram 7001.1 "Mobile road works" and "lane restriction" signs to diagram 7202. The principles of the system are given in paragraph O8.1.22 and are illustrated in Plan SVW3. The system shown in this plan is only to be operated when the traffic flow is less than that given in Table [[Page:UK Traffic Signs Manual - Chapter 8 - Part 2- Traffic Safety Measures and Signs for Road Works and Temporary Situations) - Operations 2009.pdf/O10|#table10.1|10.1 (see Section O10.4).
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