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This paper describes new driver-information systems that are suggested for cars of the 21st century and proposes a method for selecting them. This method will help government officials, product planners, engineers, designers, and scientists identify functions and features that will be most beneficial to drivers. The systems (functions) of interest were navigation, vehicle monitoring, traffic information, road-hazard warning, communications, motorist services, in-car signing, office functions, and entertainment. Features and information elements of these systems were identified and rated on three dimensions: effect on accidents, impact on traffic operations, and driver needs and wants. Based on the ranking of features, information about slick roads, accidents, congestion, construction, blocked views, emergency vehicles, and tire and brake problems would be particularly beneficial.