Evaluating the Effect of Advance Yield Markings and Symbolic Signs on Vehicle-Pedestrian Conflicts at Marked Midblock Crosswalks across Multilane Roads
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Summary
This study addresses the safety risks pedestrians face at unsignalized, marked midblock crosswalks and T-intersections on multilane roads, particularly when vehicle obstructions block drivers' views. Motivated by high pedestrian fatality rates in Massachusetts and the United States, the research evaluates the effectiveness of Advance Yield Markings (AYMs)—white triangles placed 20–50 feet before a crosswalk accompanied by a "Yield Here to Pedestrian" sign—compared to Modified Standard Yield Markings (MSYMs), which consist of stop lines within four feet of the crosswalk. The primary objective was to determine if AYMs improve driver scanning behavior and yielding in sight-limited scenarios. The researchers conducted four experiments: two using a driving simulator and two in the field in Greenfield, Massachusetts. The first simulator experiment assessed midblock crosswalks with work zone obstructions, while drivers performed a secondary cell phone task to simulate distraction. The second simulator experiment focused on T-intersections, varying crosswalk placement on the near or far side of the stem street. The third experiment involved field observations of staged pedestrian crossings at four crosswalks, comparing driver stopping rates with and without AYMs and with varying line-of-sight conditions. The fourth experiment used mobile eye-tracking technology on 32 drivers to measure visual scanning behavior toward obscured pedestrians in real-world driving conditions. Results consistently demonstrated that AYMs were superior to MSYMs across all safety measures. In the simulator, drivers using AYMs crashed with emerging pedestrians significantly less often than those using MSYMs. Specifically, at T-intersections, crash rates dropped from 64.3% with MSYMs to 25% with AYMs. Crosswalk placement also proved critical; at T-intersections, 100% of drivers crashed when the crosswalk was on the near side with MSYMs, whereas 0% crashed when the crosswalk was on the far side with AYMs. Field observations confirmed that AYMs increased the percentage of drivers stopping for pedestrians, especially when sight lines were clear. Eye-tracking data revealed that drivers were 25% more likely to glance toward obscured pedestrians when AYMs were present, indicating improved scanning behavior. The study concludes that AYMs effectively enhance pedestrian safety by prompting earlier driver scanning and yielding, particularly in complex environments with obstructions or distractions. The findings suggest that installing AYMs and positioning T-intersection crosswalks on the far side of the stem street are effective strategies for reducing vehicle-pedestrian conflicts. These results support the implementation of such treatments to improve walkability and safety in communities prioritizing vulnerable road users.
Key finding
Advance yield markings reduced pedestrian-vehicle crash rates in simulator scenarios from 64.3% to 25% at T-intersections and increased driver scanning behavior toward obscured crosswalk areas by 25% in field tests.
Methodology
mixed_methods
Sample size: 32
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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