United States Department of Transportation
i
Measuring Systemic Impacts of Bike Infrastructure Projects
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2018-05-01
[PDF-1.92 MB]
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Abstract:This paper qualitatively identifies the impacts of bicycle infrastructure on all roadway users, including safety, operations, and travel route choice. Bicycle infrastructure includes shared lanes, conventional bike lanes, and separated bike lanes. The treatment of bicycle infrastructure at intersections is of particular interest, as the management of bike lanes through intersections varies considerably, even along the same bicycle corridor. The paper identifies different bicycle infrastructure treatments along roadways and at intersections, and provides a qualitative analysis of the effects of those treatments. Geometric features, traffic characteristics, and bicycle lanes in Utah are used for a before and after comparison. No evidence was found indicating a negative effect of bicycle infrastructure on the overall roadway operations. Meanwhile, evidence indicates that bicyclists perceive an increase in safety the more other bicyclists there are around them. Providing separated bicycle lanes along segments and at intersections is expected to increase perceived safety and reduce bicycle crash frequency. The findings appear to reflect some of the complex relationship between roadway users, geometric design, and operations. The paper provides qualitative tools for making informed bicycle infrastructure decisions when designing roadway and bicycle segments and intersections.
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