In Japan, the travel time especially commuting time in the metropolitan areas, for example, the Tokyo metropolitan area, is so long that it becomes a social problem for the government to deal with. In order to make an appropriate policy, it is necessary to understand the current situation. Analysis may be made from many different aspects, the authors made an investigation from the viewpoint of the travel activity analysis in this study. Concretely, this study analyzed the difference of one day's travel time and then the relation between transportation and activities among the metropolitan areas or prefectures in Japan. The study is based on the ideas of the "time budget" from the "travel activity analysis." The data of the travel time used in the study are the data collected by NHK every 5 years, so the time serial analysis can be carried out. The time serial data are used to investigate the change of travel time (one day's travel time). Furthermore, the cross-section data are used to make the regression analysis between the one day's travel time and the other social, economic and transportaton factors in the unit of prefecture. Moreover, the Factor Analysis approach is applied for understanding the characteristics of each prefecture (metropolitan area). (A)
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