This paper provides an overview of design guidelines for the development of safe and easy to use navigation systems. Specifically, this paper considers route guidance aspects of the driver interface. The information presented summarizes the UMTRI Interface Design Guidelines (Green, Levison, Paelke, and Serafin, 1993) along with other recent UMTRI human factors research. Recommendations concern how to tell drivers where to turn (use turn displays with voice), text size (6.4 mm characters), intersection display design details (use plan or aerial views, show maps heading up, show landmarks, show distances to nearest 0.1 mi, etc.), and the speed-dependent timing of voice messages. It is particularly important that in-vehicle information be compatible with roadside information.
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