Video image detection systems (VIDS) are increasingly being used to monitor the traffic situation. Visual systems are operated with the help of image processing, which has aroused a permanent discussion concerning the quality of such systems. Therefore, different factors influencing the quality and reliability of such systems were examined within the last years. An automatic evaluation during 24 hours a day, 7 days a week has to be carried out to make an examination as comprehensive as possible. These kinds of examinations can be carried out using the “Urban Road Research Laboratory”, which is a specialised measurement section of the German Aerospace Center (DLR) Institute for Transportation Systems. An evaluation approach of the m3 system is described in this paper.