US Patent 10518825 Roof fairing with distributed flow channels

Disclosed is a roof fairing for a vehicle, such as a truck hauling a trailer. The roof fairing includes a body defining a flow directing exterior surface. The body including at least one flow directing channel that is sunk into the body toward an inner space defined by an interior surface of the body. The flow directing channel comprises a venturi construction terminating at the trailing edge. The venturi construction is configured to direct flow toward an exterior surface of the trailer when coupled to the truck.