- duration of the works; and
- proximity of junctions, pedestrian crossings, or railway level crossings.
D5.4.2 The minimum carriageway widths for two-way working and shuttle working with traffic control are summarised in Table 5.1.
| Normal traffic including buses and HGVS | Cars and light vehicles only | |
|---|---|---|
| Two-way working | 6.75m minimum | 5.5m minimum |
| Shuttle working with traffic control | 3.7m maximum | 3.7m maximum |
| 3.25m desirable minimum | 2.75m desirable minimum | |
| 3.0m absolute minimum | 2.5m absolute minimum |
D5.4.3 The factors affecting the choice of traffic control method are summarised in Table 5.2.
| Method | Maximum speed limit | Length coned area | Maximum traffic flow |
| "Give and take" | 30 | 50 m (max) | 400 veh/hr and 20 HGV.hr |
| Priority signs | 60 | 80 m (max) | 840 veh/hr |
| "STOP/GO" signs | 60 | 100m | 1400veh/hr |
| 200m | 1260veh/hr | ||
| 300m | 1060veh/hr | ||
| 400m | 940 veh/hr | ||
| 500m | 840veh/hr | ||
| Portable traffic signals | 60 | 300m (max) | No limit |
| "STOP-WORKS" | 60 | Not applicable | Not applicable |
D5.4.4 Two-way traffic, "give and take" and positive traffic control options and the criteria for their use are described in the following paragraphs. These criteria represent the best current advice in relation to the comparative merits of each, but the final decision should be made in accordance with actual site conditions and local experience.
D5.4.5 A key to the meaning of the shading and symbols used in the plans in the following sections is provided in Table A1.4 (Appendix 1). Table A1.5 (Appendix 1) explains the meaning of Details A to K in the plans and includes details of cone height and spacing where this varies according to the type of road and/or works type. Details of cone spacing are also set out in Table A1.3 (Appendix 1). Table 5.3 below gives values for the following distances shown in the plans:
D — normal siting distance to the first sign,
T — lead-in taper length,
L — minimum longitudinal safety clearance,
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