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Safety 2016, 2(4), 26; doi:10.3390/safety2040026

The Effect of Sharrows, Painted Bicycle Lanes and Physically Protected Paths on the Severity of Bicycle Injuries Caused by Motor Vehicles

1
Ronald O. Perelman Department of Emergency Medicine, New York University School of Medicine, New York, NY 10016, USA
2
Department of Population Health, New York University School of Medicine, New York, NY 10016, USA
3
Division of Trauma and Surgical Critical Care, Department of Surgery, Bellevue Hospital Center, New York University School of Medicine, New York, NY 10016, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Jake Olivier
Received: 21 February 2016 / Revised: 28 November 2016 / Accepted: 5 December 2016 / Published: 10 December 2016
(This article belongs to the Special Issue The Return of Cycling—Safety Implications)
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Abstract

We conducted individual and ecologic analyses of prospectively collected data from 839 injured bicyclists who collided with motorized vehicles and presented to Bellevue Hospital, an urban Level-1 trauma center in New York City, from December 2008 to August 2014. Variables included demographics, scene information, rider behaviors, bicycle route availability, and whether the collision occurred before the road segment was converted to a bicycle route. We used negative binomial modeling to assess the risk of injury occurrence following bicycle path or lane implementation. We dichotomized U.S. National Trauma Data Bank Injury Severity Scores (ISS) into none/mild (0–8) versus moderate, severe, or critical (>8) and used adjusted multivariable logistic regression to model the association of ISS with collision proximity to sharrows (i.e., bicycle lanes designated for sharing with cars), painted bicycle lanes, or physically protected paths. Negative binomial modeling of monthly counts, while adjusting for pedestrian activity, revealed that physically protected paths were associated with 23% fewer injuries. Painted bicycle lanes reduced injury risk by nearly 90% (IDR 0.09, 95% CI 0.02–0.33). Holding all else equal, compared to no bicycle route, a bicycle injury nearby sharrows was nearly twice as likely to be moderate, severe, or critical (adjusted odds ratio 1.94; 95% confidence interval (CI) 0.91–4.15). Painted bicycle lanes and physically protected paths were 1.52 (95% CI 0.85–2.71) and 1.66 (95% CI 0.85–3.22) times as likely to be associated with more than mild injury respectively. View Full-Text
Keywords: bicyclists; bicycle lanes; geographic analysis; injury severity; trauma bicyclists; bicycle lanes; geographic analysis; injury severity; trauma
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wall, S.P.; Lee, D.C.; Frangos, S.G.; Sethi, M.; Heyer, J.H.; Ayoung-Chee, P.; DiMaggio, C.J. The Effect of Sharrows, Painted Bicycle Lanes and Physically Protected Paths on the Severity of Bicycle Injuries Caused by Motor Vehicles. Safety 2016, 2, 26.

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