Highlights Investigates behavioral explanations for the bicycle safety-in-numbers effect. Data on 79 speed cameras locations in the City of Chicago, 2014–2016. 26 treatment locations saw increased public bike share traffic. Motor-vehicle speed violations fell at these locations relative to a control group. Estimated elasticity between rental bike usage and speed violations is −0.04.
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.
Motor-vehicle drivers’ behavioral response to increased bicycle traffic
Journal of Safety Research ; 74 ; 97-102
2020-04-16
6 pages
Article (Journal)
Electronic Resource
English
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