Impact of Weather, Road Surface and Lighting Conditions on Severity of Bicycle-Motor Vehicle Crash Injuries
Methods: We obtained 131,432 police reports for crashes occurring between 2000 and 2014 from the states of Illinois, Missouri, New York, North Dakota, Ohio, and the City of Minneapolis. The injuries were classified as: “severe” including fatal and incapacitating, and “moderate/minor” including non-incapacitating, possible or no injuries. Information on environmental factors such as weather, lighting level and road surface condition at the time of crash was extracted from crash reports. Logistic regression was used to assess the association between severity of injury and environmental variables.
Results/Outcomes: Of all reported crashes, 14,936 (11.4%) resulted in severe injuries. Crashes at dawn (Odds Ratio=1.63, 95% Confidence Interval 1.39, 1.91), dark - road lighted (OR 1.34, 95% CI 1.28, 1.40), and dark - road unlighted (OR =2.04, 95% CI 1.84, 2.25) were associated with higher odds of severe injuries as compared to crashes during daylight. Weather and road surface conditions were not significantly associated with severity of injuries.
Conclusion: Our findings suggest that lighting plays an important role in severe crash outcomes. The difference between lighted and unlighted roads suggests that environmental interventions such as adding street lighting may help reduce severe crashes.
Keywords: Bicycle; Environment; Injury Severity; Crash, Lighting
Learning Areas:Environmental health sciences
Occupational health and safety
Public health or related research
Describe the effect of lighting on report of severe bicycle crash outcomes. Assess the role of weather and road surface conditions on report of bicycle injuries.
Keyword(s): Occupational Health and Safety, Public Health Research
Qualified on the content I am responsible for because: I am the primary Author and lead investigator of this project. I work as a Chief Research Fellow at Harvard School of Public Health, and collaborate with Liberty Mutual Research Institute for Safety. My area of expertise is conducting injury epidemiological studies to understand ways that the design variables of the built environment can impact risk of various forms of injuries particularly bicycle-motor vehicle collisions.
Any relevant financial relationships? No
I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.