Girls At The Wheel

In addition to its use in steering, the steering wheel is the usual location for a button to activate the car's horn. Modern automobiles may have other controls, such as cruise control and audio system controls built into the steering wheel to minimize the extent to which the driver must take their hands off the wheel.
The steering wheels were rigid and mounted on non-collapsible steering columns. This arrangement increased the risk of impaling the driver in case of a severe crash. The first collapsible steering column was invented in 1934 but was never successful marketed. In 1968, United States regulations (FMVSS Standard No. 204) were implemented concerning the acceptable rearward movement of the steering wheel in case of crash. Collapsible steering columns were required to meet that standard.
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.