Evaluation of the effects of in-vehicle traffic lights on driving performances for unsignalised intersections
DOI: 10.1049/iet-its.2016.0084
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Summary
This study addresses the challenge of maintaining traffic efficiency and safety at unsignalised intersections, which remain common despite the prevalence of signalised roads. Motivated by the potential of vehicle-to-vehicle and vehicle-to-infrastructure communication technologies, the authors propose an "in-vehicle traffic light" system. This system projects virtual traffic signals directly into the vehicle cabin to assist drivers in determining right-of-way, aiming to reduce accidents caused by driver distraction and improve intersection throughput. The research specifically evaluates the impact of this system on driving performance and visual distraction for two types of unsignalised intersections: two-way stop-controlled and all-way stop-controlled. The researchers designed the in-vehicle traffic light system using gap acceptance theory for two-way stops and a first-come-first-served strategy for all-way stops. For two-way stops, a critical gap of 6.5 seconds determined priority between major and minor road vehicles. For all-way stops, priority was assigned based on arrival order, with left-side vehicles taking precedence in simultaneous arrivals. The system was tested in a driving simulator experiment involving 23 male participants. The experimental design employed a 2x2 factorial structure, manipulating the presence of in-vehicle traffic lights (light-on vs. light-off) and auditory warnings (audio-on vs. audio-off). Participants navigated a route containing five two-way and one all-way stop-controlled intersection. Data collected included driving operations (post-encroachment time, maximum brake stroke, stopping types) and eye-gaze behaviors (percent road centre, mean glance duration), alongside subjective evaluations of safety and acceptability. The results demonstrated that in-vehicle traffic lights significantly improved driving safety and smoothness. Specifically, the light-on condition resulted in significantly longer post-encroachment times, indicating safer gap selection, and significantly lower maximum brake strokes compared to the light-off condition, both at two-way and all-way intersections. At the all-way stop-controlled intersection, the percentage of complete stops increased from 69.57% in the light-off/audio-off condition to 91.30% in the light-on/audio-on condition. Regarding visual distraction, eye-gaze analysis showed that the percentage of gaze directed at the road centre was not significantly affected by the system. Furthermore, the mean glance duration to the head-up display remained below 0.6 seconds, suggesting the system did not cause excessive visual distraction. Subjective evaluations confirmed that participants rated the light-on conditions as significantly safer. The study concludes that in-vehicle traffic lights effectively assist drivers at unsignalised intersections by improving safety metrics and reducing harsh braking without inducing significant visual distraction. The findings support the practicality of using virtual traffic lights based on vehicular communication to enhance intersection efficiency and safety. The results imply that such systems can mitigate risks associated with unsignalised intersections, particularly by providing clear right-of-way information that reduces driver uncertainty and erratic maneuvers.
Key finding
In-vehicle traffic lights significantly improved driving safety by increasing post-encroachment times and reducing maximum brake strokes at unsignalized intersections, while maintaining acceptable levels of visual distraction.
Methodology
simulator
Sample size: 23
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | — | — | — | 1 | 2026-05-07 |
| archive | success | canonical_url | — | — | 12 | 2026-06-06 |
| extract | success | cached | — | — | 3 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-04 |
| chunk | success | chunk | — | — | 1 | 2026-06-04 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-04 |
| enrich | success | semantic_scholar | — | — | 2 | 2026-06-04 |
| promote | success | — | — | — | 1 | 2026-06-04 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 2 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 15 | 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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