Abstract
I conducted an experiment for analyzing effecs of various kinds of talking modes, especially on a mobile phone on driver's performance. Five different talking modes were set up : hand-held phone, hands free system using earphone, hands free system using loudspeaker, ordinary face to face conversation and no-talking. The author focused on mental workload and situation awareness of surroundings in driving and also focused on the difference concerning these two factors in each talking mode. The study concerning mental workload and situation awareness reveals that no significant difference was found between face to face conversation and hands free system using loudspeaker, while significant difference was found between face to face conversation and using earphone.
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