Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/213

DUAL CARRIAGEWAY ROADS

The principles for marking the running lanes on the primary carriageway alongside the works area are:


 * coning to Detail F is used — if existing carriageway markings are suitably located and in good condition then Detail C1 may be used; and
 * a sign indicating the number of lanes open to traffic (7205) with distance plate (7209) "For x miles" is required located on the near side at 1/2 mile intervals.

If a section of the works zone is used purely for access then consideration should be given to placing a "keep left/right” sign (610) on the approach to any works area located after the access. The designer shall assess if additional 610 signs are needed where specific risks in the works zone or changes in road geometry would justify additional guidance to road users.

The principles for marking the running lanes on the secondary carriageway are:
 * the buffer zone is marked with cylinders and studs to Detail K;
 * white lining or temporary studs to Detail J used as marking between running lanes;
 * signs indicating the distance over which the current conditions apply (7201 .1 with symbols 7280 to 7284.1 and 7288) with a top panel "NARROW LANES" (7264) are placed on the central reservation for primary carriageway traffic using the secondary carriageway and repeated at 1/2 mile intervals through the contra-flow; the first sign is located at the end of the initial crossover;
 * signs on the central reservation should be screened from traffic on the primary carriageway;
 * in the secondary direction signs indicating the distance over which the current conditions apply (7201.1 with symbols 7280 to 7284.1 and 7288) are placed on the near side for secondary carriageway traffic and repeated at 1/2 mile intervals through the contra-flow; the first sign is located opposite the start of the return crossover in the secondary direction; and
 * if a temporary vehicle safety restraint barrier is used to separate opposing flows, signs to diagram 7201.1 must not incorporate the contra-flow symbol shown in diagram 7288.

A temporary mandatory speed limit will be in place; signs to diagram 670 should be continued from the lead-in zone; for the spacing of speed limit repeater signs, see Table 3.4, Note 1.

No relaxations apply. 212