The use of accident data in problem identification

This paper examines the historical use of accident data and the traditional 'traffic engineering' use in the collision diagram to determine treatments for specific sites and to study the effects of the treatments. The concepts of the collision diagram are then extended to identify problems in general for a whole state, city or region. It is shown how the problem can be further analysed or broken into component parts to identify the predominant characteristics of each major accident type (a).