Abstract
This study investigates effects of hierarchization of auditory signal on driver behavior when various information provision services are introduced into in-vehicle information systems. The characteristic of auditory signal was determined based on subjective criticality and urgency for each information services. Moreover, motion-based driving simulator experiment was conducted, and driver behaviors were measured and evaluated comparing between the information services with hierarchized/non-hierarchized auditory signals and voice messages. The results show the information service with hierarchized auditory signals is more effective for collision avoidance than that with non-hierarchized auditory signals. Voice messages may confound drivers in recognizing criticality of information service, although the information service with voice message is slightly more effective than that with hierarchized auditory signals.
