Traffic flow characteristics vary substantially from site to site throughout the country. As a result, it is frequently useful to group sites into similar types. General information on each road type can then be used to help estimate traffic flow characteristics at a particular site of a given road type. This report describes a grouping of road sites that is objective and that broadly reflects the underlying mix of journey purposes giving rise to the traffic at the site. The classification is based on the availability of sample data on a weekday in August and a weekday in a neutral month such as May or October. The classification has found application in the DTp COBA method of economic evaluation of major road schemes. (A)

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