Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/121



The normal method of traffic operation for shuttle working during daylight at sites on minor roads will be a natural "give and take" system. This system may be used provided that:
 * drivers approaching from either direction can see 50m beyond the end of the works;
 * the speed limit is 30mph or less;
 * the total two-way traffic flow is less than 400 veh/hr;
 * the total HGV flow is less than 20veh/hr; and
 * the length of the works from the start of the lead-in taper to the end of the exit taper is 50m or less.

Where the above criteria for "give and take" systems cannot be met, then one of the positive traffic control systems should be adopted; see Sections D5.8 to D5.10.

The natural "give and take” system of shuttle working should not be operated at night or in conditions of poor visibility. If the works are to continue into the hours of darkness, traffic control should be by temporary traffic signals.

These principles are illustrated in Plan 5C3. The principles for the advance signing are:
 * two advance signs are normally required:
 * a "road works" sign (7001) on the near side only in both directions; and
 * a " road narrows” sign (517) on the near side only in both directions; a "Single file traffic" plate 518) is required.

The principles for the signing of the lead-in taper are:
 * coning to Detail B at 45° tapers is used — see Table A1.5 (Appendix 1); Table 5.3 in Section D5.4 specifies the taper length T;
 * a "keep left/right” sign (610) is placed on the near side at the start of the taper; and
 * a "lane closed" barrier (71 05) with a "keep left/right" sign (610) is placed at the end of the taper behind the cones — the "keep left/right" sign should be mounted directly above the barrier or may be placed in front of the barrier or the last cone of the taper.

The principles for the works zone are:
 * coning to Detail C1 is used to mark the edge of the works area safety zone. No additional signing is required.

The principles for the exit taper are: 120
 * coning to Detail B at 45° taper is used; and