Bicycle safety in Bogotá: A seven-year analysis of bicyclists’ collisions and fatalities

September 10, 2021

Bicyclists’ mortality in Bogotá for the period 2011 to 2017ITS Associate Director and UC Berkeley City and Regional Planning Professor Daniel Rodriguez and others recently published Bicycle safety in Bogotá: A seven-year analysis of bicyclists’ collisions and fatalities in Accident Analysis and Prevention.

Authors include: Germán A. CarvajalSchool of Economics and Department of Industrial Engineering, Center for Optimization and Applied Probability, Universidad de los Andes, Olga L. SarmientoSchool of Medicine, Universidad de los Andes, Andrés L. Medaglia and Sergio CabralesDepartment of Industrial Engineering, Center for Optimization and Applied Probability, Universidad de los Andes, Daniel A. RodríguezDepartment of City and Regional Planning, Institute for Transportation Studies, University of California, Berkeley, D. Alex QuistbergDepartment of Environmental & Occupational Health and Urban Health Collaborative at the Dornsife School of Public Health, and Segundo LópezHealth and Road Safety Department, World Resources Institute Ross Center for Sustainable Cities

Abstract

Road safety research in low- and middle-income countries is limited, even though ninety percent of global road traffic fatalities are concentrated in these locations. In Colombia, road traffic injuries are the second leading source of mortality by external causes and constitute a significant public health concern in the city of Bogotá. Bogotá is among the top 10 most bike-friendly cities in the world. However, bicyclists are one of the most vulnerable road-users in the city. Therefore, assessing the pattern of mortality and understanding the variables affecting the outcome of bicyclists’ collisions in Bogotá is crucial to guide policies aimed at improving safety conditions. This study aims to determine the spatiotemporal trends in fatal and nonfatal collision rates and to identify the individual and contextual factors associated with fatal outcomes. We use confidence intervals, geo-statistics, and generalized additive mixed models (GAMM) corrected for spatial correlation. The collisions’ records were taken from Bogotá’s Secretariat of Mobility, complemented with records provided by non-governmental organizations (NGO). Our findings indicate that from 2011 to 2017, the fatal bicycling collision rates per bicyclists’ population have remained constant for females while decreasing 53 % for males. Additionally, we identified high-risk areas located in the west, southwest, and southeast of the city, where the rate of occurrence of fatal events is higher than what occurs in other parts of the city. Finally, our results show associated risk factors that differ by sex. Overall, we find that fatal collisions are positively associated with factors including collisions with large vehicles, the absence of dedicated infrastructure, steep terrain, and nighttime occurrence. Our findings support policy-making and planning efforts to monitor, prioritize, and implement targeted interventions aimed at improving bicycling safety conditions while accounting for gender differences.

Read the article: https://doi.org/10.1016/j.aap.2020.105596