Abstract: A method for automatically categorizing the general variety of motor-vehicle types moving through a given checkpoint, according to their predominant characteristics; basically involving features such as length, height, axle count, existence of a trailer, and specific envelop contour (i.e.--motorcycle, car, truck, bus, limousine, etc.). Advantageously employing Doppler-based CW-radar for ultimate real-time accuracy, resolving even closely spaced vehicles having differing acceleration/deceleration rates; the system will establish a vehicle's classification during stop-and-go or at speed. Real-time velocity information is read from successively radar targeted vehicles, while combined with real-time information acquired via at least one special electronic profiling-window apparatus employing beam emitters/receptors or lasers in making incremental transverse-slice readings of traversing vehicles.