Page:UK Traffic Signs Manual - Chapter 5 Road Markings. 2003 (Sixth Impression 2009).pdf/45



On dual carriageway roads, amber studs placed adjacent to the central reservation may have red reflectors on the reverse for use when contra-flow working is needed for road maintenance purposes.

The colour of the road stud body may be:

(i) white,

(ii) the same as the reflectors or retroreflecting material,

(iii) a natural metallic finish, or

(iv) any other neutral colour (including black).

In the case of studs placed temporarily at road works, the stud body must be fluorescent green / yellow. The use of temporary studs is described in Chapter 8.

The spacing of road studs used with double white lines is dealt with in para. The spacing of studs used with centre lines and lane lines is described in tables 4-1, 4-2 and 4-3, and studs used in conjunction with continuous edge lines or with diagram 1010 in table 4-5 and para 10.11.

On dual carriageway roads where red, white and amber studs are used, these are normally spaced at 18 m intervals. There may be some minor advantage in offsetting the white lane line studs 9 m longitudinally relative to the red and amber studs. Where red studs are used adjacent to chevron markings, the spacing should be closed up to 3 m centres.

The standard 18 m spacing should be reduced to 9 m on bends with a radius of curvature less than 450 m, or on roads particularly prone to fog and mist or where there is a severe dazzle problem caused by glare from the headlamps of oncoming vehicles.

Road studs to diagram 1055.1 or 1055.2 used to mark a crossing place must be coloured white, silver or light grey (regulation 11(4)). They may not be fitted with reflective lenses or with a steady or intermittent light source, but may be formed from retroreflecting material. Although the Regulations permit the use of stainless steel, aluminium, thermoplastic or paint products, some types of metal studs can be slippery when wet, and the potential risk to two-wheeled traffic should be borne in mind. Similar considerations apply to the studs used at other types of pedestrian crossing. 43