Abstract: An aerodynamic accessory, such as a front and/or a rear spoiler, is adjustable by a deployed working position and a retracted rest position, and its positioning can be controlled automatically in accordance with vehicle conditions reflecting the need for road/tire traction. These vehicle conditions may include vehicle speed, crosswinds, road surface roughness or wetness, and/or road grade, these factors taken singly or in combination. The aerodynamic accessory may be a rear spoiler retractable to lie flush with the trunk lid and/or a front spoiler capable of selectably reducing the air-flow clearance between the road surface and the front end of the vehicle. Specific vehicle condition detection devices and techniques are also disclosed.

Abstract: A front spoiler device is capable of moving steadily between active and retracted positions. The front spoiler device, according to the present invention, has an elongated front spoiler member extending across the entire width of the front end of the vehicle body. The front spoiler member is supported from the vehicle body by a plurality of guide assemblies which guide vertical movement of the spoiler member. The guide assemblies are spaced apart from each other so as to support the spoiler both at its center and at its opposite ends.