Systemic Analysis of Bicycle and Pedestrian Safety in Utah
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2022-05-01
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Edition:Final, Jul 2019 to May 2022
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Abstract:The objective of this systemic analysis of bicycle and pedestrian safety in Utah was to identify risk factors, potential treatment sites, and potential countermeasures. The systemic approach to roadway safety management is a proactive means of identifying risk factors, countermeasures, and (high-risk, rather than just high-crash) treatment locations. First, a literature review identified practices for systemic safety analysis and risk factors for bicycle/pedestrian crashes from previous research. Second, the data collection process selected study locations (segments, signalized, and non-signalized intersections), assigned pedestrian/bicycle-involved crashes (2010–2019) to those locations, and assembled data on exposure, transportation (roadway geometry and traffic), and neighborhood community (land use, built environment, and sociodemographic) characteristics. Third, data analysis generated results from 48 Poisson or negative binomial crash frequency models, segmented by: mode, location type, crash type (all or fatal and serious injury), network type (state only or state and federal aid), and with or without exposure. Altogether, these efforts generated risk factors for bicycle and pedestrian crashes at various types of locations. Fourth, potential countermeasures (linked to specific risk factors) were listed. Fifth, an example interactive interface—displaying model results and empirical Bayes estimates of crash frequencies—was developed to help identify potential treatment locations using filtering and/or ranking. Finally, recommendations for implementation focused on mitigating data limitations through improved/expanded data collection processes, integrating the results and interface into existing safety management tools and processes, and repeating this systemic analysis periodically to continue improving safety outcomes for people walking and bicycling in Utah. Part of this analysis is based on UDOT Research Project UT21.08: "Safety in Numbers? Developing Improved Safety Predictive Methods for Pedestrian Crashes at Signalized Intersections in Utah Using Push-button-Based Measures of Exposure" by Ahadul Islam and Dr. Michelle Mekker.
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