Commercial Truck Driver Fatigue, Alertness, and Countermeasures Survey

NHTSA · 1999 · ROSA P / United States. Federal Highway Administration

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Summary

This study addresses the critical safety issue of driver fatigue and loss of alertness in commercial motor vehicle (CMV) operations, which are significant contributors to fatal and injury crashes. Motivated by the need for additional data on drivers with irregular schedules, night driving duties, and daytime sleeping patterns, the research aimed to determine the prevalence of fatigue-contributing factors and assess the methods drivers use to counteract fatigue. The survey was designed to extend prior findings from the Driver Fatigue and Alertness Study (DFAS). The methodology involved administering a 12-minute questionnaire to long-haul tractor-trailer drivers at inspection stations in California, Georgia, Missouri, and Virginia during February and March 1995. Participants were required to be driving loaded vehicles, have driven at least 60,000 miles in the previous year, and have been on the road for at least 24 hours prior to the interview. A total of 511 interviews were completed. The sample was predominantly male (96.5%), with a mean age of 42, and included 31.5% owner-operators. Most drivers reported irregular routes (84.1%) and variable working hours (84.7%). Key findings revealed that 76.7% of drivers required 6–8 hours of sleep to feel rested, with 91% primarily sleeping in sleeper berths. Drivers who split their rest periods slept fewer hours than those resting in one stretch. Regarding alertness, 28% of drivers reported dozing or falling asleep at the wheel within the past month, with those having irregular schedules experiencing significantly more incidents. Notably, 59% of those who fell asleep were always aware of the impending danger but continued driving. Work pressures led nearly half of the drivers to sacrifice sleep to maintain schedules, with owner-operators more likely to do so than company drivers. While 44.6% of drivers were awake for six or more hours before starting their trips, common countermeasures included cooling the cab, stretching, and listening to the radio. The use of illicit stimulants was rare, though 70% reported knowing drivers who used alcohol to relax. The significance of these results lies in highlighting the commonality of drowsiness episodes in long-haul driving and the risks associated with drivers continuing to operate vehicles despite awareness of fatigue. The findings informed subsequent Federal Highway Administration (FHWA) initiatives, including updates to 60-year-old hours-of-service rules to ensure sufficient daily sleep opportunities. Additionally, the study supported ongoing research into fatigue management technologies, such as in-vehicle systems that assess driver alertness and provide feedback to encourage rest.

Key finding

28 percent of surveyed commercial truck drivers reported dozing or falling asleep at the wheel within the past month.

Methodology

survey

Sample size: 511

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified_with_issues.

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
• circadian factors
• 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, observational prevalence