The following figure shows an approach that can be adopted for developing an Accident Proneness Index for each category of vehicles. It may be generally assumed that the traveling environment in general is unsafe due to a large number of factors. However, there are certain specific factors that influence accidents (for a particular category of vehicle) more adversely than other minor factors. The factors of unsafe environment such as road condition, driving habits, condition of vehicles, enforcement level, etc. are difficult to measure effectively.
Accidents are generally classified as single vehicle accidents in which the vehicle is either colliding with fixed objects or with pedestrians or the vehicle may fall in a ditch etc. and multiple vehicle accidents in which two or more