Girls At The Wheel

Power steering gives the driver an easier means by which the steering of a car can be accomplished. Modern power steering have almost universally relied on a hydraulic system, although electrical systems are steadily replacing this technology. Mechanical power steering systems (ex. Studebaker, 1952) have been invented, but their weight and complexity negate the benefits that they provide.
While other methods of steering passenger cars have resulted from experiments, for example the "wrist-twist instant steering" Mercury Park Lanes controlled by two 5-inch (127 mm) rings, none have yet been deployed as successfully as the conventional large steering wheel.