Accidents at urban mini-roundabouts

The report gives the findings of a study of accident risk based on a national stratified sample of 200 3-arm and 100 4-arm urban mini-roundabouts on 30mph single carriageway roads (2100 personal injury accidents). Tabulations are given showing frequencies, severities and rates by type of central island and by region. The accidents are also tabulated by accident group, road user involvement and number of casualties per accident. The main objective of the study was to develop relationships between accident frequency and traffic flow, road features, layout, geometry, land use and other variables. The technique of generalised linear modelling was used to develop such relationships for different types of accidents