Summary: This paper describes the method of automatic detection of vehicles’ collision zones based on analysis of video sequences registered by digital camera at signalised traffic intersection. Moving vehicles, visible on particular frames, are detected and their trajectories are stored. Tracks of vehicles which are moving in the same direction create some kind of ”corridors” and overlaps of those “corridors” (common areas) are quite precise localisation of collision zones. The detailed description of algorithm and results obtained during analysis of selected video sequences is presented.