In recent years, travel pattern has been diversified in Japan, and it is required to forecast the travel demand appropriately by considering the situations of a society.
In this study, we focus on the urban travel behavior of workers on a workday and a non-workday, and aim to build a model of trip generation for discretionary trips. After an analysis of data obtained from a survey of the actual urban travel behavior on a workday and a non-workday, we propose a new hypothesis on the trip generation mechanism of a worker. The hypothesis states that there exist a common factor which affects the generation of discretionary trips both on a workday and a non-workday, and that workday and non-workday trips are mutually influenced. Then, by applying a covariance structure model we examine the hypothesis and estimate the effects of various factors on the generation of urban discretionary trips.
As a result of analysis, it was found that there exist common factors which affect travel behavior both on a workday and a non-workday as well as factors which are specific to a workday and a non-workday.
It was also found that effects of transport service levels on the generation of discretionary trips are significant especially on a non-workday.