Improving Safety for People Walking and Biking at Roundabouts
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Summary
This study addresses the safety challenges faced by pedestrians and bicyclists at roundabouts, a design increasingly common in the United States. While roundabouts improve safety for motorists by reducing speeds and eliminating high-risk crash types, they present unique risks for vulnerable road users (VRUs) due to low driver yielding rates, particularly at exit points. The research was motivated by limited national data on VRU safety at these intersections and the need to understand driver behavior to inform safety improvements. The primary objectives were to evaluate driver yielding behavior toward VRUs at roundabout entry and exit legs and to examine driver speed selection in the presence and absence of VRUs. The researchers conducted field evaluations at 16 roundabout locations in Minnesota, selected to represent diverse urban and suburban settings, traffic volumes, and geometries, including sites with rectangular rapid flashing beacons (RRFBs). At each site, 100 crossing events were staged for both pedestrians and bicyclists, equally distributed between entry and exit legs. Driver yielding responses were recorded via video cameras. Additionally, at nine of the sites, vehicle speed profiles on the entry approach were measured using handheld lidar guns to capture continuous speed data as vehicles approached the crosswalk. The study utilized mixed-effects logistic regression to analyze yielding behavior and multiple linear regression to model speed selection across different scenarios. The results revealed significant disparities in yielding behavior. Yield rates at roundabout entries generally exceeded 80%, whereas exit leg yield rates averaged below 40%. Yielding was higher for pedestrians than bicyclists and was influenced by crossing initiation points, with higher rates observed when crossing from splitter islands compared to curbs. The presence of RRFBs, even when inactive, correlated with higher yielding rates. Conversely, yield rates were significantly lower at double-lane roundabouts or those with multiple travel lanes on approaches or exits. Regarding speed selection, drivers began braking more rapidly within 450 feet of the crosswalk. Vehicles that yielded to VRUs reduced speed by approximately 1.3 mph per 50 feet between 200 and 450 feet upstream, and by 5 mph per 50 feet within 200 feet. Vehicles that did not yield exhibited lower rates of speed reduction and higher approach speeds. The study concludes that roundabout geometry and traffic control devices significantly impact VRU safety, with exit legs and multilane configurations posing greater risks due to lower yielding and higher speeds. The findings provide evidence-based recommendations for the Minnesota Department of Transportation and other agencies to enhance safety, particularly at locations with moderate to high VRU activity. The authors note that while yield rates serve as a surrogate safety measure, future research should incorporate crash data to better correlate yielding behavior with actual crash outcomes.
Key finding
Driver yielding rates at roundabout exits are significantly lower than at entries, and both yielding behavior and speed selection are positively influenced by the presence of rectangular rapid flashing beacons and the type of vulnerable road user.
Methodology
field_study
Sample size: 16
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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