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Safety and Nonoptimal Usage of a Protected Intersection for Bicycling and Walking: A Before-and-After Case Study in Salt Lake City, Utah

Author

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  • Torrey Lyons

    (Department of City and Regional Planning, University of North Carolina at Chapel Hill, New East Building, CB3140, Chapel Hill, NC 27599, USA)

  • Dong-ah Choi

    (Department of City and Metropolitan Planning, University of Utah, 375 South 1530 East, Suite 220, Salt Lake City, UT 84112, USA)

  • Keunhyun Park

    (Department of Landscape Architecture and Environmental Planning, Utah State University, 4005 Old Main Hill, Logan, UT 84322, USA)

  • S. Hassan Ameli

    (Department of City and Metropolitan Planning, University of Utah, 375 South 1530 East, Suite 220, Salt Lake City, UT 84112, USA)

Abstract

This paper describes a before-and-after case study of a protected intersection in Salt Lake City, Utah. The intersection was completed in late 2015 and represented one of the first examples of a protected intersection design in North America. We analyzed bird’s-eye view video data that was recorded before the intersection was implemented and compared it against video data recorded from the exact same location after implementation. In order to examine changes in intersection usage and behavior, we operationalized safety in terms of the frequency of nonoptimal behaviors demonstrated by active transportation modes. We found that active transportation usage of the intersection has increased since the new configuration, with most of that growth attributable to e-scooter users. There was minimal change in the rates of nonoptimal behaviors by pedestrians. Bicyclists showed mostly decreased rates of nonoptimal behaviors, suggesting improved safety for this mode. E-scooter users, however, demonstrated nonoptimal behaviors at very high rates as compared with other active modes. This case study gives evidence that a protected intersection can have positive effects on active transportation volume and safety in a U.S. context.

Suggested Citation

  • Torrey Lyons & Dong-ah Choi & Keunhyun Park & S. Hassan Ameli, 2020. "Safety and Nonoptimal Usage of a Protected Intersection for Bicycling and Walking: A Before-and-After Case Study in Salt Lake City, Utah," Sustainability, MDPI, vol. 12(21), pages 1-15, November.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:21:p:9195-:d:440362
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    References listed on IDEAS

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    1. Thomas Götschi & Jan Garrard & Billie Giles-Corti, 2016. "Cycling as a Part of Daily Life: A Review of Health Perspectives," Transport Reviews, Taylor & Francis Journals, vol. 36(1), pages 45-71, January.
    2. John Pucher & Ralph Buehler, 2017. "Cycling towards a more sustainable transport future," Transport Reviews, Taylor & Francis Journals, vol. 37(6), pages 689-694, November.
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    Cited by:

    1. Zhang, Yuting & Nelson, John D. & Mulley, Corinne, 2024. "Learning from the evidence: Insights for regulating e-scooters," Transport Policy, Elsevier, vol. 151(C), pages 63-74.

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