 By manipulating the position of the planetary gear housing, the active steering ECU can synthesize a variable steering ratio or generate steering actions independently of the driver.In a parking situation, the computer varies the ratio so that the steering wheel needs fewer than two full turns to move the wheels lock to lock.As vehicle speeds increase, the steering ratio increases, so it takes larger movements of the steering wheel to move the wheels and that lessens the usually increasing vehicle response resulting from increased speed.