System and method for reacting to an impact involving a motor vehicle in which an anticipatory sensor system assesses the probable severity of the impact based on data obtained prior to the impact and initiates deployment of an external safety device via an actuator in the event an impact above a threshold probable severity is assessed. The anticipatory sensor system includes receivers for receiving waves or energy and a pattern recognition system for analyzing the received waves or energy, or data representative thereof, to assess the probable severity of the impact. The pattern recognition system ascertains the identity of an object from which the waves or energy have been emitted, reflected or generated. The pattern recognition system includes a processor embodying a pattern recognition algorithm designed to provide an output of one of a number of pre-determined identities of the object.