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A field trial has been carried out using a set of automatic recording systems, Driving Monitoring Recorder (DMR) with GPS and Event Eye Camera (EEC). They were installed on total numbers of 105 vehicles in four fleets of taxis and trucks in Tokyo area for 4 years in order to assess the implications in driving characteristic and traffic conditions. DMR can record the data such as running speed versus time continually, and frequencies of emergency behavior are counted and recorded on drive whenever hard braking is exceeded by 3.75m/s 2, and rapid starting and sharp acceleration is exceeded by 3.5 m/s 2. Also, EEC can record the driver views in pre- and post scene during 10 seconds by event detecting trigger. The 80 subjects are taxi drivers including 10 females and 30 truck drivers. The drivers were monitored for some months continuously. In addition, the drivers were examined by a driving aptitude test.

Accident reconstruction cannot be carried out without assumptions. So the assumptions must be examined to determine whether errors exist. In order to make this examination, it is desired to present the assumed accident scenes in a clear manner. In such cases where many vehicles are involved or behaviors of the involved vehicles are complicated, it is difficult to present the accident scenes by means of a two dimensional drawing or a clay model. Three dimensional computer graphics can be used as an effective means of presentation in these cases. Because once the computer models of accident scenes are made, they can be easily observed from any position of view and can be easily remade according to need. The purpose of this paper is to show how a computer graphics is used in the process of accident reconstruction.

The severity of vehicle crush and occupant injury is explained in terms of the changes in kinetic energy or change in velocity during impact. The work is calculated by mathematical models such as CRASH 3 program on the basis of vehicle damage information collected from the accident scene. In application of CRASH 3, the impact orientation and the direction of the principal force, etc. must be inferred by user, based on measurement and experience. Therefore it is one of the most important tasks to estimate the collision configuration from physical evidence. The individual experience methods in this regard may lead to big misunderstandings and mistaken conclusions in the reconstruction; however, very little has been studied the determination of the collision configuration in the reconstruction.