Abstract
This study aims firstly at examining the actual condition of travel behavior changes on both weekdays and weekend days in a local city of Japan by using a series of data from person-trip surveys conducted in 1977, 1991 and 2001. Secondly, it is to show that these travel behavior changes were determined by their factor attribute changes and their factor composition changes. Thereby, quantitative understanding of these temporal macro changes is attained, and it can find out direction of appropriate analysis required for future travel demand prediction. Consequently, the recent change of individuals' structures does not have as much effect on trip generation as the individuals themselves who reduce their trip generations. Dramatic modal split change such as car shift was caused by the change of traveler's mode itself rather than by the change of OD trip patterns, and trip attraction change was caused by the change of destination choice from other zones rather than that zone changed its trip generation.
