A Study on Performance Evaluation for Signalized Intersections Considering Risk-Taking/Aversion Behaviors of Users
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Summary
This study addresses the lack of comprehensive evaluation metrics for signalized intersections that account for the risk-taking and risk-aversion behaviors of pedestrians and cyclists. The authors argue that long signal cycle lengths, common in Japan, cause significant delays that motivate users to engage in dangerous behaviors, such as rushing into intersections during flashing yellow lights or left-turning vehicles ignoring right-of-way. To address this, the paper proposes a "Risk Evaluation Value" index that simultaneously quantifies two types of disutility: physical loss from traffic conflicts and temporal loss from delay. The methodology involves defining risk as the product of incident probability and loss intensity. The authors use field survey data from multiple intersections to analyze crossing characteristics, including speed and timing. They employ binary choice logit models to estimate the probability of pedestrians rushing into intersections and left-turning vehicles accepting gaps between pedestrians. The Post Encroachment Time (PET) is used to measure conflict severity, while delay is calculated based on waiting times. A weighting factor is derived to compare the relative importance users place on conflict risk versus delay risk. Key findings indicate that pedestrians are more sensitive to conflict risks than cyclists, with a calculated weight for conflict risk relative to delay of 138 for pedestrians compared to 85.4 for cyclists. The analysis reveals that longer crossing distances and elapsed time after the flashing yellow light begin increase conflict risk (lower PET). Furthermore, left-turning vehicles are more likely to pass through pedestrian gaps when setback distances are large, improving visibility. The study demonstrates that the proposed risk evaluation value can effectively quantify intersection performance. The significance of this work lies in its application to intersection design and signal control. Using a case study of the Yotsuya intersection, the authors evaluated four scenarios involving changes to crossing width, setback distance, and cycle length. They found that a combined strategy of shortening the crossing width, reducing the setback, and shortening the cycle length could reduce the overall risk evaluation value by 7.0%. Specifically, shortening the cycle length was identified as an effective measure for reducing both delay and conflict risks. The study concludes that integrating geometric and signal control adjustments based on this risk metric can improve safety and efficiency at signalized intersections.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-20 |
| archive | success | unpaywall | — | — | 2 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-20 |
| chunk | success | chunk | — | — | 1 | 2026-06-20 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-20 |
| promote | success | — | — | — | 1 | 2026-06-20 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-20 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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