The concept of traffic conflict was initiated in the Uni ted States in the 60s and raised a lot of interest in many countries: it was an opening towards the develop ment of a new tool for safety evaluation and the diagnosis of local safety pro blems. The need for such a tool was great, because of the many situations where accident data was either scarce, unsatisfactory or unavailable. Development of Traffic Conflict Techniques (TCT) started simultaneously in the 70s in several European count ries and new studies were also undertaken in the Uni ted States, Canada and Israel. The need for...