Eliminating sun glare disturbance at signalized intersections by a vehicle to infrastructure wireless communication : final report.
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Summary
This research addresses the safety hazard posed by sun glare at signalized intersections, where intense sunlight impairs driver visibility and increases crash risk. Existing mitigation strategies, such as wearing polarized sunglasses, altering routes, or adjusting driving times, are often impractical or ineffective. The study evaluates the efficacy of the Drivers’ Smart Advisory System (DSAS), a Vehicle-to-Infrastructure (V2I) wireless communication technology based on Radio Frequency Identification (RFID). The DSAS provides drivers with audio warning messages regarding upcoming traffic signal status, aiming to compensate for visual impairment caused by sun glare and improve driving performance. The study employed a driving simulator to test driver behavior under controlled conditions. Thirty participants, selected to reflect the demographic distribution of Houston, Texas, were recruited. The experimental design included nine scenarios covering three traffic movements (left-turn, straight, and right-turn) under varying conditions: with and without sun glare, and with and without DSAS messages. The research focused specifically on the red signal phase, as sun glare during this phase poses the highest crash risk. Four primary performance metrics were analyzed: mean approach speed, half kinetic energy speed, brake response time, and braking distance. Statistical analyses, including t-tests, were conducted to assess the negative impacts of sun glare, the compensatory effect of DSAS messages, and the influence of socio-demographic factors such as age, gender, education, and driving experience. The results demonstrated that sun glare significantly degraded driving performance, particularly by increasing brake response times and distances. However, the DSAS messages effectively compensated for these visual impairments. Statistical analysis confirmed that the DSAS improved driving performance to levels comparable to normal visual conditions, with significant benefits observed for left-turn and through movements. Specifically, the system reduced brake response time and braking distance, mitigating the safety risks associated with glare. Socio-demographic analysis revealed that elderly drivers drove slower and required longer response times, while highly educated individuals drove slower than those with lower education levels during right turns. Male drivers were found to drive faster than females during straight movements. The study concludes that V2I wireless communication systems like the DSAS are a viable solution for eliminating sun glare disturbances at signalized intersections. By providing instant signal status information, the system enhances driver safety awareness and reaction capabilities when visual cues are obscured. The findings support the implementation of such connected vehicle technologies to improve roadway safety. The authors recommend further research involving eye-tracking analysis and more complex scenarios to facilitate large-scale on-road testing and broader deployment of the DSAS.
Key finding
The DSAS wireless warning system compensated for reduced visibility caused by sun glare, improving driving performance metrics such as brake response time and distance to levels similar to normal visual conditions, especially for left-turn and through movements.
Methodology
simulator
Sample size: 30
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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Information type
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- Empirical Findings: behavioral performance data
- Methodological Resource: measurement protocol, tool software