User required information modality and structure of in-vehicle navigation system focused on the urban commuter

Current available functions of In-Vehicle Navigation System (IVNS) are approaching to the multimedia system, and its information types become diverse by manufacturing company for accomplishing the on-board multimedia system. Concerning these trends, Human-Machine Interface (HMI) is regarded as more crucial issue for driver's safety and system usability. Also, this kind of issue includes determining the type of information that would be most beneficial to the particular group of users, when and where they need specific information, and the modality in which it should be presented. This paper conducted two kinds of experiments. One is an assessment of driver's mental workload of two kinds of modality to verify the developed Revision of NASA-TLX (RNASA-TLX), and the other is survey-based study to prioritizing the user required information that presented from IVNS. This experiment conducted in the real road situation using IVNS simulator especially focused on the urban commuter.