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The innovative Quadrasteer system consists of an electromechanical unit that turns the rear wheels up to 12 degrees, in relation to the front wheels. It senses the driver's desired steering input with a steering-wheel position sensor. This information feeds into an on-board microprocessor that determines appropriate rear-wheel angles, based on steering input and vehicle speed. The processor then supplies its data to an electric motor, which, based on algorithms, drives the rear steering rack through a planetary gearset to turn the rear wheels in the proper direction.