Car-Sharing Usage Island, Built Environment, Travel Demand: Evidence from a Correlation Analysis

Car-sharing services offer a convenient mobility option, especially for door-to-door trips. As a non-stop transit mode, car-sharing usage regularity is more significantly interrelated with built environment due to the proximity of pick up and drop off locations to the trip’s origin and destination. Previous relevant studies employ direct ridership models to understand how built environment elements are associated with car-sharing demand at a global level. The models involved simply using a prior assumed linear or log-linear relationship. This study focuses only on the relationship between built environment elements and car-sharing usage in hot and cold spots to reveal the key mechanism of action. First, car-sharing usage islands, defined as geographical areas of interest with a relatively high or low concentration of car-sharing usage, are identified based on percolation theory. Next, this study innovatively adopts gradient boosting decision trees (GBDT) to explore the collective influence of built environment attributes, and their non-linear effects on ridership. On the one hand, the empirical results reveal a hierarchical structure of car-sharing usage islands, and regional imbalances of travel supply and demand are sporadically identified across several regions by comparing the spatial distribution of usage islands. On the other hand, home-work attributes have the strongest influences on car-sharing demand, and most other built environment variables as well as transport facility factors are associated with car-sharing ridership in a different and discontinuous non-linear way, regardless of island’s type. These threshold effects in all situations offer valuable implications for planners to achieve desirable environmental benefits efficiently.


  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: 25p

Subject/Index Terms

Filing Info

  • Accession Number: 01764234
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-00691
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:23AM