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; identify a position of the object in at least two images of the plurality of images; determine, based on the plurality of images, a value indicative of a time-to-collision (TTC) that is responsive to a relative acceleration between the vehicle and the object; determine if the vehicle and the object are on a collision course based on the position of the object in the at least two images and the value indicative of the TTC; and cause a response in the system if the vehicle and the object are determined to be on a collision course.