This part of BS 5489 gives recommendations for the lighting of junctions at grade (single-level), including major/minor priority junctions where at least one road is lit as a traffic route in accordance with BS 5489 : Part 2 and for junctions where lighting is provided on otherwise unlit traffic routes. It also includes recommendations for the general arrangement of lighting, siting, height of columns and choice of lantern types. For junctions, luminance-based recommendations are made in relation to those luminance provisions applying along routes linking to form the junction. Recommendations for roundabouts are expressed in illuminance terms in consideration of the wider range of dimensional road design and the application of alternative types of lighting equipment. For parts 1-3 of this standard see IRRD 803293, C 8960 (IRRD 803472), and IRRD 828495.
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