1. A method for use in an active safety system installed on a host vehicle, comprising the steps of: for each of a plurality of consecutively-arranged target objects in a common path in front of the host vehicle, calculating a time to collision (TTC) between the target object and the host vehicle; evaluating one or more of the calculated TTCs to determine if the host vehicle is likely to collide with one or more of the target objects corresponding to the evaluated one or more calculated TTCs; and when the host vehicle is likely to collide with one or more of the plurality of target objects, triggering one or more collision avoidance measures.