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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

1
Department of City and Regional Planning, University of North Carolina at Chapel Hill, New East Building, CB3140, Chapel Hill, NC 27599, USA
2
Department of City and Metropolitan Planning, University of Utah, 375 South 1530 East, Suite 220, Salt Lake City, UT 84112, USA
3
Department of Landscape Architecture and Environmental Planning, Utah State University, 4005 Old Main Hill, Logan, UT 84322, USA
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(21), 9195; https://doi.org/10.3390/su12219195
Received: 28 September 2020 / Revised: 30 October 2020 / Accepted: 2 November 2020 / Published: 5 November 2020
(This article belongs to the Section Sustainable Transportation)
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. View Full-Text
Keywords: protected intersection; direct observation; quasi-experimental design; natural experiment; e-scooter; behavioral research protected intersection; direct observation; quasi-experimental design; natural experiment; e-scooter; behavioral research
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MDPI and ACS Style

Lyons, T.; Choi, D.-a.; Park, K.; Ameli, S.H. Safety and Nonoptimal Usage of a Protected Intersection for Bicycling and Walking: A Before-and-After Case Study in Salt Lake City, Utah. Sustainability 2020, 12, 9195. https://doi.org/10.3390/su12219195

AMA Style

Lyons T, Choi D-a, Park K, Ameli SH. Safety and Nonoptimal Usage of a Protected Intersection for Bicycling and Walking: A Before-and-After Case Study in Salt Lake City, Utah. Sustainability. 2020; 12(21):9195. https://doi.org/10.3390/su12219195

Chicago/Turabian Style

Lyons, Torrey, Dong-ah Choi, Keunhyun Park, and S. H. 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 12, no. 21: 9195. https://doi.org/10.3390/su12219195

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