1. A security system for a movable vehicle provided with an enabling system, the security system comprising: at least one optical image receiving unit structured to produce image signals from at least a portion of the face of a person located at a driver's station in a passenger compartment of the vehicle; a processor including an electronic facial-recognition system coupled to said at least one optical image receiving unit responsive to the image signals and controllably coupled to the enabling system, and an electronic storage device coupled to said facial-recognition system to store a set of image signals, such that said facial-recognition system activates the enabling system only if signals representative of select characteristics of a scanned face of the person derived from the image signals produced by said at least one optical image receiving unit match a member of a set of signals stored in said electronic storage device, each member representative of select characteristics of the scanned face of an authorized operator.