The roof support on either side of A car's windshield. An extremely sophisticated, computer controlled suspension system that uses powered actuators instead of conventional springs and shock absorbers. The actuators position a car's wheels in the best possible manner to deal with road disturbances and handling loads. The drag produced by a moving object as it displaces the air in its path. In car design the positive and negative lift of the airflow is studied in wind tunnels.
Negative lift is preferred to press the vehicle closer to the ground.
Car air resistance is also studied. A front spoiler mounted beneath the bumper and shaped to reduce the airflow under the car. All four wheels are driven by the engine. AWD systems use a center differential to allow the front and rear wheels to rotate at different speeds. AWD provides better traction than front or rear-wheel drive.