Abstract
The trip rate is a fundamental index in the field of transportation planning. It was supposed to be invariant during a long time period in the work of transportation planning. However, it was found to be declined in some previous works or studies, recently. Compared to the generations in other age groups, the early 30`s generation has more drastic trend of the trip rate reduction. This study investigates the variation of trip number of the early 30's generation with respect to their individual attributes. The questionnaire data and person trip survey data in the Kinki region are used for empirical study.
The major findings suggest: 1) income and owning a driver license impact the number of trip generation; 2) the trip rates of them owning a driver license and that of unemployed females reduce dramatically, although the trip rates of them were in a large number in former time; 3) these factors contribute to the reduction of trip number of them with multiple trips and that with limited trips.
