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In this study, the accident simulation tests, the so-called crash tests, enforced by legislation and put into praxis are evaluated in regard of their conformity with reality. They are based on accident analyses from investigations at the place of accident, which are carried out by a scientifically trained team which documentates details of the accident event. 826 cars involved in traffic accidents with cars, trucks and other objects, in the greater vicinity of Hannover (FRG) were at our disposal for evaluation purposes. The study clearly reveals that impact simulations like those carried out at present, cover only approximately 34% of all situations of road traffic. This conclusion is derived from a comparison of accident framework conditions like overlapping degree, impact impulse direction and impact situation. For the frontal impact the offset impact, with two-third degree of overlapping, without rail-bound lead should be favoured.

Accident documentations on GIDAS (German In-Depth-Accident Study) from 1999 to 2005 are used for this study dealing with the effectiveness of the side airbag protection for car occupants. An analysis of real world accidents was carried out by ARU-MUH (Accident Research Unit - Medical University Hannover). The data were collected based on the spot documentation in time after an accident event. Based on the accident sampling process, the results of this study are representative for the German traffic accident situation. In order to determine the influence and the effectiveness of airbags, only those accident configurations with comparable conditions on impact direction are used for the study, therefore only cases with impact to the compartment, a delta-v-range 5 to 50 km/h and for struckside seated belted occupants were selected.

The In-Depth Investigations of the Accident Research Unit Hannover (Germany), which have been carried out since 1973 are described in the paper. The importance of the detailed analysis consists in the method, in the statistical approach and the continuous data collection over the years. The government as well as industrial manufacturers use this data. Since 1985 a statistical procedure including a mathematical weighting procedure has been applied. About 1000 cases per year are collected. In the paper, principal aspects in the technique of data collection, definitions of variables and possibilities of data usage are described. The limitations of in-depth investigations are discussed in principle, and demands for a worldwide level are pointed out.

Starting directly at the scene of the accident facts about 127 motorized and 136 non-motorized- two-wheel accidents that occurred in Hanover, West Germany, have been collected and analysed. These accidents were analysed case by case and in this publication, an attempt is made to provide a survey with regard to the collision mechanism and the injuries sustained by the involved cyclist. Measures to reduce the number of accidents as well as to influence the course of the accidents, are shown. The characteristic injury patterns and kinematic motions provide the guidelines for further security measures and serve as the basis for experimental tests.