Forward collision risk reduction

The present invention relates to a method for determining a safety zone (30) of a foreign object (28) for a forward collision risk reduction system (26), the foreign object (28) being located in front of a vehicle (10) hosting the system, the method comprising the steps of: - determining the type of the foreign object (28); - setting the safety zone (30) to a predetermined value corresponding to the type of the foreign object (28); - determining the traffic behaviour of the foreign object (28); - determining if the traffic behaviour corresponds to a species of a predetermined group of traffic behaviours, and - if the traffic behaviour corresponds to a species of a predetermined group of traffic behaviours, modifying the safety zone (30) in accordance with a predetermined species function corresponding to the species.