Motorcoach Driver Fatigue Study 2011
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Summary
This study investigated whether commercial motorcoach drivers operate at the limits of Federal Motor Carrier Safety Administration (FMCSA) hours-of-service (HOS) regulations, specifically assessing if they engage in non-24-hour work/rest cycles that disrupt circadian rhythms. The research was motivated by regulatory allowances for 10–15 hours of duty followed by 8 hours off, which could theoretically enable "backwardly rotating" schedules that desynchronize sleep from the natural day/night cycle. The primary objective was to determine if drivers pushed these regulatory limits, resulting in distributed duty start times, truncated sleep, impaired performance, and increased fatigue. The researchers conducted a naturalistic study involving 84 commercial motorcoach drivers from Charter, Tour, Regular Route, and Commuter Express operations. Participants were monitored for an average of 31 consecutive days while maintaining their normal work and rest schedules. Data collection utilized wrist-worn actigraphs to record minute-by-minute sleep/wake history, duty/sleep diaries to log duty start/end times and breaks, and smartphone-based psychomotor vigilance tasks (PVT) to measure reaction time. Subjective fatigue and sleepiness were assessed using the Samn-Perelli Fatigue Scale and the Karolinska Sleepiness Scale (KSS) at the beginning and end of duty periods. The sample consisted predominantly of middle-aged, overweight males who were fit for duty according to their employers' standards. The findings indicated that drivers generally operated well within HOS limits and maintained circadian synchronization. Duty start times clustered in the early to mid-morning, with Regular Route and Commuter Express drivers starting earlier than Charter or Tour drivers. The average duty period was slightly more than 9 hours, rarely exceeding the 15-hour regulatory maximum, and drivers averaged approximately 43 hours on duty per week. Total sleep time per 24 hours fell within the recommended range of 7–9 hours, though sleep duration was shorter on duty days and inversely correlated with longer duty times. Performance metrics showed a decline in PVT scores, while subjective reports of fatigue and sleepiness increased at the end of duty periods compared to the beginning. The study concludes that motorcoach drivers effectively balance work demands with adequate sleep, avoiding the non-24-hour work/rest cycles that would disrupt circadian alignment. The data suggest that, on average, drivers do not push the limits of current HOS regulations, thereby mitigating the risks associated with circadian misalignment and sleep truncation. These findings provide empirical evidence that current operational practices in the motorcoach industry generally support sufficient sleep and maintain performance within safe parameters, despite regulatory allowances for extended duty hours.
Key finding
Motorcoach drivers maintained morning duty start times and average sleep durations of 7 to 9 hours, demonstrating that they generally operate well within hours-of-service regulations rather than pushing regulatory limits.
Methodology
naturalistic
Sample size: 84
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.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- truck driver fatigue
- shift work driving
- time on task
- hours of service
- sleep deprivation
- drowsiness detection algorithms
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Empirical Findings: physiological data