dimensions are in metres). These illustrate the placing of the lines in relation to the cross section of the road(see TD 27 / 96 for guidance on marking slip roads).
4.64 Edge of carriageway markings between the running lanes and the hard shoulder or hard strip may use raised rib profiles (diagram 1012.2 on motorways and 1012.3 on all-purpose roads; see paras 4.39 to 4.48 for details).
4.65 Edge lines should be accompanied by red unidirectional retro reflecting road studs adjacent to the hard shoulder or near side hard strip and, on motorways and dual carriageway roads, coloured amber adjacent to the central reservation. For use during contra-flow working, the amber studs may have red reflectors on the opposite face. The use of road studs in conjunction with road markings is dealt with in more detail in section 6.
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