Developing Vehicle Aggressivity Rating System

Vehicle crash compatibility is of major interest in road safety research as it focuses on both vehicle crashworthiness and aggressivity. Most of the research into vehicle safety to date has focused on vehicle crashworthiness promoting vehicle designs that overlook the protection of occupants in the ‘other’ vehicle in a vehicle-to-vehicle collision. Most recently this issue has lead to the development of new methods of vehicle aggressivity rating.

This study presents two proposed vehicle aggressivity rating methods. The ‘subject’ car aggressivity is estimated based on injury outcome to the driver of the ‘other’ vehicle involved in a two-vehicle collision. The logistic regression technique is applied in order to adjust risk of driver injury for a number of endogenous and exogenous factors. The ability of the methods to ‘rate’ vehicle models in terms of their aggressivity performance in two-vehicle crashes is briefly described. The issue of relative versus absolute risk of injury concepts, and confounding between crashworthiness and aggressivity is outlined. Desirable properties for a high quality aggressivity rating system are also proposed.