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Two studies investigate the effects of presentation modalities (visual/auditory/repeated auditory) and complexity levels of different in- car road information on subjective preferences and on perceptual and cognitive performances of drivers. In real driving situations, each driver was alerted by a ringing signal prior to the presentation of a road information message or a map display associated with a road guidance message; the experimenter asked each driver 30 s. later to recall the message or the itinerary. Results suggest that in real driving situations, short auditory road information messages or associated with map displays optimize perceptual and cognitive performances and driving safety; written messages are of greater interest if screened when the vehicle is at rest.

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