Abstract: Pressure sensors situated on opposite sides of a land motor vehicle relative to the direction of travel enable a signal to be generated which is indicative of the presence and the direction of a gust of cross-wind striking the vehicle. Flaps, which are connected to the sensors and are normally closed flush with the body, are movable to project selectively from the outer surface of the motor vehicle, in the event of a gust, to induce in the vehicle a slewing moment in the direction opposite the direction of the gust.

Abstract: Air intakes, usually constituted by N.A.C.A. intakes, are formed in the sides of the motor vehicle immediately in front of each rear light unit. When the vehicle is moving, each of the intakes induces a flow of air towards the light unit. As it passes through flow-conditioning means, such as a deflector element mounted in a corner position on the light unit or a slot-like duct which passes through the light unit, this flow is transformed into a turbulent air flow. As it spreads into the space surrounding the surface of the light unit and/or flows over it, this air flow prevents the deposition of dirt on the light unit.