1. A system for providing an indication of a possible collision between a vehicle and an object, the system comprising: at least one processing device configured to: receive a plurality of images from an image capture device; use the plurality of images to determine a plurality of values indicative of a Time-to-Collision (TTC) based on an indicator of a relative velocity between the vehicle and the object; determine a rate of change of the plurality of values indicative of the TTC at a selected time; and based on the determined rate of change, cause a response in the system if a possible collision between the vehicle and the object is anticipated.