Drag reducing device for multi-truck shipment when mounted

Abstract From the Canadian patent

The rooftop drag reducing device comprises a top and a bottom and may be mounted to the cab of trucks for semi-trailers at the factory. The device may then be conveniently collapsed with the top fitting inside the bottom when multiple trucks are shipped with the second and third truck, for example, having their front wheels mounted to the fifth wheel of the truck in front of them. Since the drag reducing device has had its height reduced it will pass under low bridges. The device is initially integrally molded in one piece and cut into the top and bottom portions along a oblique cut line step. The top may be left connected to the bottom at the front to form a living hinge. Alternatively a, …