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This thesis addresses a fundamental Human Factors question associated with the design of the Human-Machine Interface (HMI) for in-vehicle electronic route guidance systems: what navigation information should such systems provide to drivers? To avoid the development of systems which demand excessive amounts of drivers' attention and processing resources or which are not satisfactory to the intended user population, it is critical that appropriate information is provided when and where needed. However, a review of the relevant literature revealed a paucity of research concerning this issue.

Six empirical studies are described in the thesis, utilising a variety of methodological approaches. Drivers' preferences for different navigation information are explored via interviews, subjective rating scales and a direction giving exercise. Road trials consider the performance-related benefits of particular types of navigation information.