Non-linear effects of built environment factors on mode choice: A tour-based analysis
Jia Fang
University of Florida
https://orcid.org/0000-0002-7337-0163
Xiang Yan
University of Florida
https://orcid.org/0000-0002-8619-0065
Tao Tao
Carnegie Mellon University
Changjie Chen
University of Florida
https://orcid.org/0000-0001-6036-2239
DOI: https://doi.org/10.5198/jtlu.2024.2403
Keywords: random forest, non-linear effects, built environment, tour-based mode choice, SHAP
Abstract
Understanding the connections between the built environment and travel mode choice is a major research topic in transportation. However, existing studies usually examine the relationship through trip-based analyses rather than tour-based approaches. A tour consists of multiple trips that originate and end at the same place, which is increasingly considered the more appropriate analysis unit for travel behaviors. Applying a tour-based approach, this study employs random forest to investigate the non-linear impacts of built environment factors and tour attributes on different mode combinations of a tour. We find that tour attributes and connectivity-related variables (e.g., block size and intersection density) have a strong association with the use of active travel modes when their values are within a certain threshold. In addition, capturing mode change behaviors offers more nuanced understanding of how various built environment variables shape people’s decision to combine modes in a tour.
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