Summary: | Car navigation systems have recently become a popular assist system for automobiles. On the other hand, lack of dedicated motorcycle navigation system is still an issue. This is because currently provided navigation system utilizable for motorcycle has difficulties for riders to obtain information while driving. Recent research propose of using the head-up display technology is considered to solve this issue. Although, topics about the amount of information to provide using the head-up display has not yet been discussed. Since providing too much information distracts driving behaviors, amount of information control is required to prevent inattentive driving behaviors. To evaluate the preferable amount of information, we conducted an experiment using the immersive motorcycle simulator integrated with a head-up display. The experiment measured motorcycle riders' viewpoint movements using the eye-mark recorder to observe the duration spent against the information provided using the head-up display. Through the experiment, we presented different length of Japanese syllabary characters (Hiragana) on the head-up display to 10 subjects. Experiments results indicate presenting 5 Japanese syllabary characters is the preferable amount of information to the motorcycle rider while driving. Applying information theories, we conclude that the preferable information transmission rate is approximately 16 bits per seconds.
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