Ergonomics of steering wheel mounted switch-how number and arrangement of steering wheel mounted switches interactively affects performance

Cars equipped with steering wheel mounted switches are increasing. However, the number and arrangement of switches differ among automobile manufacturers, and there are no specific design guidelines on the number and arrangement of steering wheel mounted switches. Such guidelines would contribute to safety and efficiency by determining the optimum number of steering wheel mounted switches and their arrangement. Consequently, such a study would be expected to result in a reduction in driver errors and vehicle accidents.