Multi-City Study of an Engineering and Outreach Program to Increase Driver Yielding at Signalized and Unsignalized Crosswalks
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Summary
This study addresses the rising rates of pedestrian fatalities, which reached a 30-year high nationally and in Minnesota. Motivated by a 2018 study that demonstrated improved driver yielding through a multifaceted program including high-visibility enforcement (HVE), this research sought to determine if engineering and outreach alone—without police enforcement—could improve driver yielding at both unsignalized and signalized intersections. The study aimed to disentangle the effects of engineering from enforcement, evaluate countermeasures at signalized intersections, and assess whether such programs could shift driving culture citywide. Conducted in Saint Paul and Minneapolis from April to November 2021, the six-month study utilized a field data collection design across selected treatment and generalization sites. Engineering treatments included temporary bump-outs, pedestrian refuges, in-street R1-6 signs, leading pedestrian intervals (LPIs), hardened centerlines, and specific signage. Outreach efforts involved community feedback signs displaying weekly yielding percentages. Researchers collected observational data on driver yielding behavior at baseline and post-treatment intervals, comparing treated sites against untreated generalization sites to isolate treatment effects. Results indicated modest, site-specific improvements in yielding at unsignalized treatment sites, with rates increasing from 48.1% to 65.5% in Saint Paul and from 19.8% to 38.8% in Minneapolis. However, no improvements were observed at generalization sites, suggesting no citywide shift in driving culture. At signalized intersections, findings were mixed: Saint Paul showed no significant improvements in turning yields, though treatments may have mitigated declines seen at generalization sites. In Minneapolis, right-turning yields improved at treatment sites, but left-turning yields did not. Specific interventions, such as R1-6 signs and temporary infrastructure, proved effective at unsignalized crossings, while LPIs and right-turn signage impacted right-turning behavior at signalized intersections. The study concludes that engineering and outreach programs without enforcement are effective for local, site-specific improvements but insufficient for altering broader driving culture. The authors recommend using these treatments for low-speed, unsignalized crosswalks and signalized intersections where right-turn yielding is a concern. They advise against relying on feedback signs unless yielding rates are already near 50% and caution that confounding factors, such as the absence of enforcement and pandemic-related conditions, may limit the efficacy of engineering-only approaches compared to multifaceted programs.
Key finding
An engineering and outreach program without police enforcement produced modest, site-specific improvements in driver yielding at treated crosswalks but failed to generate citywide cultural shifts or consistent improvements at generalization sites.
Methodology
field_study
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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- Applied Guidance: countermeasure evaluation