The development of accident-remedial intervention levels for rural roads

This report describes a study for DETR Road Safety Division to suggest a set of accident-remedial intervention levels for use on rural roads (ie those with speed limits greater than or equal to 50 miles/h) as these roads rarely qualify for consideration under traditional intervention levels. Rural intervention levels have been developed which take exposure into account explicitly (using accident rates - accidents per km, or per vehicle-km, or per bend or junction), or which relate to expected proportions of different accident types - using national data. When the accident occurrence in a particular area or on a given road exceeds the intervention level, it is suggested that that area/road should be considered for accident-remedial treatment. (A)