School trips are essential in urban transportation and are associated with physical activities of students. This paper investigates the effect of the built environment and socio-demographics variables on simultaneous decision-making behavior, including departure time choice and travel mode choice for home-based school trips. Using Kunming, China, as the study area, a regional household travel survey and point of interest data are used in empirical analysis. Based on a cross-nested logit (CNL) model, the estimation outcomes provide new insights into better understanding students' simultaneous decision-making behavior, finding that with higher school density, students tend to walk and bike to school during off-peak periods. Better bike and pedestrian facilities contribute to more students actively traveling and having less dependence on automobiles. It also was found that students would pay more to reduce travel time to school according to the value of travel time savings.
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