This paper presents the state of the art of the investigation of traffic accidents by the police in Switzerland.

After marking the traces at the scene of the accident a stereopair of photographs is taken, showing the entire scene. By analysing these stereophotographs in the lab a scaled situation plan is obtained. All material of evidence is secured and analysed at the crime lab by order of the district attorney. The results of such analyses are presented. Special attention will be given to accidents with pedestrians and with two-wheel drivers.