Investigating the Influence of Takeover Request Warning Methods on Driver Tension in Level 3 Automated Driving
DOI: 10.54941/ahfe1006067
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Summary
This study investigates how different takeover request (TOR) warning methods and their repetition influence driver tension and habituation in Level 3 automated driving. The research addresses a critical gap in existing literature, which has largely focused on sensory modality comparisons or driver distraction, rather than the specific efficacy of TORs when drivers are fully disengaged from the driving task. Given the growing demand for logistics and driver shortages, effective TOR design is essential for safe transitions from autonomous to manual control. The study specifically examines whether repeated exposure to warnings leads to habituation, which could diminish alert effectiveness, and how varying warning intensities might mitigate this effect. The experiment utilized a Unity-based driving simulator to replicate a congested highway environment with speeds of 30–40 km/h. Twelve male participants (mean age 22.7 years) performed a secondary task involving visual and manual interactions to ensure complete disengagement from driving. Three types of TORs were tested: auditory alarms, visual text messages on a monitor, and indicator light changes. Each warning had high and low intensity parameters (e.g., 1000 Hz vs. 400 Hz for sound; red vs. yellow text). The study employed three conditions across eight TOR trials: a "weak" condition (all low intensity), a "combination" condition (varying intensity per trial), and a "switch" condition (mostly low intensity with high intensity at trials 3 and 6). Physiological responses were measured via skin conductance (SC) recorded from the left foot, while psychological responses were assessed through subjective questionnaires completed after each trial. Results indicated that all drivers successfully switched to manual control after the TORs. No significant physiological habituation was observed in SC data across any condition, suggesting that physiological responses remained stable over the short duration of the experiment. However, significant psychological habituation was evident in the subjective data. In the weak condition, tension ratings dropped significantly from the third trial onward. In the combination and switch conditions, significant decreases in tension occurred from the fifth trial, though the switch condition showed no significant drop during the high-intensity trials (3 and 6). Participants in the combination condition generally reported higher tension levels than those in the switch condition. The findings suggest that psychological habituation occurs more rapidly than physiological habituation, particularly when warnings are monotonous and low-intensity. While varying warning intensities or patterns can temporarily delay habituation, it does not eliminate it. The study concludes that modifying TOR presentation methods is effective for short-term engagement but that long-term habituation remains a risk. Future research should increase the number of experimental trials to better capture physiological habituation and explore more diverse warning patterns to sustain driver attention over extended periods.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-08-09 |
| archive | success | canonical_url | — | — | 1 | 2026-08-09 |
| extract | success | cached | — | — | 5 | 2026-08-23 |
| clean | success | clean | — | — | 2 | 2026-08-10 |
| chunk | success | chunk | — | — | 2 | 2026-08-10 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 2 | 2026-08-10 |
| promote | success | — | — | — | 1 | 2026-08-09 |
| summarize | success | llm | qwen3.8-27b-gittensor | summ-v5 | 3 | 2026-08-23 |
| tag | success | vector_similarity | — | — | 17 | 2026-08-11 |
| verify | success | — | — | — | 1 | 2026-08-09 |
Summary generated by qwen3.8-27b-gittensor on 2026-08-23; verification: pending re-verification.
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