1. A method for classification of vehicles comprising: (a) calibrating a transformation angle between a camera image and a road surface; (b) detecting moving objects on the road surface in the camera image; (c) establishing a vertical axis of symmetry for each of the moving objects; (d) detecting dominant horizontal edges intersecting with the vertical axis of symmetry for each of the moving objects; (e) tracking the dominant horizontal edges for a plurality of consecutive video frames; (f) projecting each of the dominant horizontal edges onto a ground plane; (g) treating each pair of adjacent projected edges as a projected surface; (h) calculating changes in the projected surface; and (i) calculating distinct structural signatures from the changes in the projected surfaces.