From "warning" to "guidance": design of a closure control zone for eight-lane freeways and evaluation of its regulating effects on driving behavior.
DOI: 10.3389/fpubh.2026.1803755
archive: archived pipeline: cataloged verified
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Summary
This study addresses the lack of standardized control zone designs for emergency full closures on eight-lane freeways, a scenario requiring complex, successive lane changes that current guidelines do not adequately cover. The research aims to shift traffic control strategies from passive warning to active guidance by designing a dedicated closure control zone and evaluating how specific warning sign content influences driver behavior under varying weather conditions. The researchers designed a control zone based on principles of "active guidance, graded transition, and terminal enforcement," featuring a 2,000-meter warning area with graded speed limits and physical channelization in transition and buffer areas. Two warning sign variants were developed: a basic version providing incident and distance information, and an enhanced version adding the advisory instruction "Keep Right to Exit." To evaluate these designs, a 2 × 2 factorial driving simulator experiment was conducted with 30 licensed drivers. The study manipulated sign type (basic vs. enhanced) and weather condition (clear vs. dusty, with visibility set to 200 meters). Participants performed mandatory lane changes from the leftmost lane to an exit, with lateral and longitudinal driving behaviors recorded at 10 Hz. Results demonstrated that the enhanced "Warning & Advice" sign significantly improved driving performance compared to the basic sign. Drivers exposed to the enhanced sign initiated lane changes earlier, providing 966 meters of additional spatial margin in clear weather and 610 meters in dusty weather. The enhanced sign also reduced the aggressiveness of three successive lane changes by 35.8%, 23.8%, and 23.5% in clear weather, and by 49.3% and 31.3% for the first two changes in dusty weather. Longitudinally, the enhanced sign decreased maximum deceleration aggressiveness by 21.7% in clear weather and 25.1% in dusty weather, while improving deceleration smoothness by 16.0% and 25.4%, respectively. The benefits of the enhanced sign were amplified in dusty conditions, indicating a synergy between environmental caution and explicit guidance. The findings conclude that incorporating actionable advice into warning signs optimizes driver decision-making, effectively compensating for environmental uncertainty and enhancing safety during complex multi-lane closures. This study provides an empirical basis for designing closure control zones tailored to eight-lane freeways, suggesting that well-designed information can mitigate behavioral risks associated with sudden mainline closures.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | PubMed Central | — | — | 1 | 2026-06-19 |
| 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 |
| enrich | success | openalex | — | — | 1 | 2026-06-20 |
| promote | success | — | — | — | 1 | 2026-06-19 |
| 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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