Motor-vehicle drivers’ behavioral response to increased bicycle traffic |
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| Institution: | 1. North Carolina Agricultural and Technical State University, United States;2. University of North Carolina at Chapel Hill, United States;3. Children’s Hospital of Philadelphia & University of Pennsylvania Perelman School of Medicine, United States;4. AAA Foundation for Traffic Safety, United States;1. University of Alabama at Birmingham, Department of Psychology, Birmingham, AL, USA;2. University of Pennsylvania, School of Nursing, Philadelphia, PA, USA;3. Children’s Hospital of Philadelphia, Center for Injury Research and Prevention, Philadelphia, PA, USA;4. University of Alabama at Birmingham, Department of Biostatistics, Birmingham, AL, USA;1. Division of Safety Research, National Institute for Occupational Safety and Health, 1000 Frederick Lane, Morgantown, WV 26508, USA;2. National Safety Council, 1121 Spring Lake Drive, Itasca, IL 60143, USA;1. The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Shanghai, 201804, China;2. College of Transportation Engineering, Tongji University, 4800 Cao’an Road, Shanghai, 201804, China;3. Centre for Infrastructure Systems, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore |
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| Abstract: | Introduction: This paper investigates whether motor-vehicle driver behavior changes when there are more bicycles on the road. Method: Data on trips on a rapidly expanding public bike share scheme in Chicago are combined with speed violations captured by a network of 79 cameras. Using weekly data from July 2014 to December 2016, violations at 26 sites where there was a considerable increase in bicycle traffic are compared with a control group of 53 locations where rental bicycles are not available. Results: An increase in rental bicycle usage is statistically related to a reduction in the number of speeding violations, with an estimated elasticity of −0.04. Conclusion: The increased presence of bicyclists makes at least some motorists drive more cautiously. Practical Application: This research provides some insight into the mechanism behind the observed reduction in crash rates as bicyclists become more numerous. Some motorists moderate their speeds allowing more time to avoid collisions and a reduction in the severity of the vehicle-bicyclist collisions that still occur. |
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| Keywords: | Bicycles Speeding Chicago |
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