Page:UK Traffic Signs Manual - Chapter 5 Road Markings. 2003 (Sixth Impression 2009).pdf/24

 The edge lines of the following diagrams may also make use of raised profile lines:

(i) diagram 1040.3 - reduction of the number of lanes available,

(ii)diagram 1040.5 - approach to a termination of the hard shoulder, and

(iii) diagrams 1042 and 1042.1 - chevro nmarking, when used between main carriageway and slip road, or between bifurcating or converging carriageways (but not at a roundabout).

Raised profile markings must not be used as part of any marking or in any circumstances other than as specified above.

Raised profile markings should be discontinued where pedestrians and cyclists cross the road (e.g. at refuges) or at other places where cyclists are likely to cross them. A plain edge line to diagram 1012.1 should be used instead. This should normally extend a minimum distance of 1m either side of the crossing point.

Where gullies or similar features occur in the hard strip, cyclists may need to cross the adjacent edge line marking in order to avoid them. Any raised profile marking adjacent to such features should be replaced with a plain edge line for a distance of 10 mon each side of the gully.

When raised profile markings are laid on a curve of less than 1000 m radius, motorcyclists may find themselves in difficulty if there is a wide hardstrip or hard shoulder and they are tempted to cross onto it. The raised ribs tend to destabilise two-wheeled vehicles on appreciable bends. If there is any concern that motorcycles might frequently cut across the line, the ribs may be omitted, although the improved night-time wet weather visibility will obviously not then be available.

Drainage gaps of 100 to 150 mm should be provided at intervals of approximately 36 m where the longitudinal fall is flatter than 1 in 150, and there is a crossfall towards the profiled marking.

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