Traffic impacts of bicycle facilities : final report.

Lindsey, Greg; Hourdos, John; Lehrke, Derek; Duhn, Melissa; Ermagun, Alireza; Singer-Berk, Lila · 2017 · ROSA P / Minnesota. Dept. of Transportation. Research Services & Library

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Summary

This study investigates the traffic impacts of various on-street bicycle facilities, aiming to provide engineers with data-driven insights for designing efficient and safe multimodal transportation systems. Motivated by the need to understand how different facility designs influence driver behavior and traffic flow, the research was funded by the Minnesota Department of Transportation and the Local Road Research Board. The project sought to fill gaps in existing design guidelines by empirically evaluating how drivers interact with cyclists across different infrastructure types. The methodology combined a comprehensive literature review with field observations. Researchers analyzed 22 design manuals and 100 research papers to categorize existing guidelines and identify evaluation needs. For the empirical component, the team conducted video-based observations at nine roadways in Minnesota featuring distinct facility types, including buffered bicycle lanes, striped bicycle lanes, sharrows, signed shared lanes, and shoulders of varying widths. Driver behaviors during interactions with cyclists were categorized into five types: no change in trajectory, deviation within the lane, encroachment into the adjacent lane, completion of a passing maneuver, and queuing behind cyclists. Statistical modeling was employed to confirm descriptive findings from the field data. The results indicate that clearly demarcated bicycle lanes significantly reduce negative traffic impacts. Drivers on roadways with buffered or striped bicycle lanes were less likely to encroach into adjacent lanes, pass cyclists, or queue behind them compared to drivers on roadways with sharrows, signed shared lanes, or no facilities. Queuing behind cyclists, identified as the most significant impact on vehicular traffic flow, was highest on roads with no facilities or shared facilities lacking marked lanes. Statistical models confirmed that buffered and striped lanes offer greater predictability in driver behavior. Conversely, the study found no evidence that interactions on roadways marked only with sharrows or signs differed significantly from those with no facilities, suggesting these treatments do not substantially alter driver behavior despite potentially alerting drivers to cyclist presence. The study concludes that from the perspective of reducing traffic impacts and increasing behavioral predictability, buffered or striped bicycle lanes are superior to sharrows or signage. These findings imply that transportation planners should prioritize marked lanes where space and resources allow. While sharrows and signs may serve to alert drivers to the potential presence of cyclists, they do not mitigate traffic disruptions such as queuing or lane encroachment. The report provides specific design considerations for each facility type, reinforcing that marked lanes are the most effective solution for managing vehicle-bicycle interactions and maintaining traffic flow.

Key finding

Drivers on roadways with buffered or striped bicycle lanes were less likely to encroach into adjacent lanes, pass, or queue when interacting with cyclists than drivers on roadways with sharrows, signs designating shared lanes, or no bicycle facilities.

Methodology

naturalistic

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• cyclist safety
• perceptual countermeasures