Fatigue is a leading theme in serious truck crashes, yet it is hard to prove after the fact. A driver rarely admits falling asleep, and a clean logbook can suggest compliance with hours-of-service limits. Plaintiff counsel who stop at the logs miss a second line of evidence: whether the driver had an untreated sleep disorder, whether the medical examiner and carrier knew or should have known, and whether the company did anything about it.
Hours of Service Is the Floor, Not the Ceiling
The federal hours-of-service rules limit property-carrying drivers to 11 hours of driving within a 14-hour window, require a 30-minute break after eight hours of driving, and cap weekly on-duty time at 60 or 70 hours depending on the carrier's schedule. Compliance with those limits is a defense argument, but it is not proof that the driver was rested. A driver can obey the rules and still be dangerously impaired by poor sleep quality, an erratic schedule, or a medical condition. Treat the electronic logging device data as the start of the analysis, and look for patterns: repeated runs ending at the edge of the limits, short rest periods between shifts, night-to-day schedule flips, and unexplained gaps.
Obstructive Sleep Apnea and the Regulatory Gap
Obstructive sleep apnea is common among commercial drivers and is associated with excessive daytime sleepiness and increased crash risk. Federal regulations do not impose a standalone sleep apnea screening requirement. The agency considered rulemaking years ago and did not adopt one. Instead, the driver's medical examiner must determine physical qualification under the federal standards, and guidance from advisory bodies suggests risk factors the examiner should consider, such as body mass index, neck circumference, hypertension, and reported sleepiness. The absence of a mandatory rule is a point the defense will emphasize. The response is that the regulations still require a medical determination that the driver has no condition likely to interfere with safe operation, and carriers have independent duties to hire and supervise competently.
Where the Evidence Lives
- Driver qualification file: the medical examiner's certificate and the long-form examination report, including the answers to health history questions.
- Medical examiner records: the examiner's notes on risk factors, any referral for sleep testing, and the length of the certification period. A one-year or shorter certificate often signals a monitored condition.
- Carrier health and wellness programs: screening initiatives, sleep study requirements, CPAP compliance monitoring, and any documented refusal to test.
- Driver's treatment records: sleep studies, CPAP usage downloads, and prescriptions. Obtain these with appropriate authorizations or subpoenas.
- Dispatch and scheduling data: messages pressuring delivery times, changes to routes, and load assignments close to the end of the shift.
- Post-crash records: any post-accident testing, interview statements, and the driver's phone and wearable data showing sleep and wake times.
CPAP compliance downloads can be especially probative. A device usually records hours of use per night. A pattern of nonuse in the days before the crash supports an inference of untreated apnea, though the defense may point to alternative explanations. Preserve the device and demand its data promptly, because overwritten memory limits the record.
Linking Fatigue to the Crash Itself
Crash reconstruction can support the fatigue theory by showing the absence of evasive action. A truck that drifted from its lane, did not brake before impact, or struck a stationary motorcycle at full speed suggests a lapse in attention. Event data recorders and forward-collision systems may show the lack of braking or steering input. Pair the reconstructionist with a sleep medicine expert who can explain the physiological mechanism and the distinction between fatigue and distraction. Without that testimony, the jury may regard the claim as speculation.
Carrier Liability Theories
Beyond vicarious liability for the driver, claims for negligent hiring, retention, and supervision depend on what the carrier knew. If the driver disclosed a sleep disorder, reported sleepiness to dispatch, or had prior near-miss events, the carrier's failure to act is the heart of the case. In some jurisdictions, such evidence can also support a punitive damages claim where the conduct reflects conscious disregard for safety. Our truck and motorcycle category discusses how to plead and prove these theories alongside hours-of-service violations, and our auto accidents coverage addresses insurance layers for high-severity claims.
Practical Steps at Intake
Send a preservation letter that identifies the ELD data, driver qualification file, medical certification records, CPAP device, phone records, dispatch communications, and onboard camera footage. Request the driver's complete health-related files from the carrier, and identify treating providers early. Prepare for privacy objections by narrowing requests to conditions relevant to fatigue and driving.
Takeaways
- Treat logbook compliance as the beginning of the fatigue inquiry.
- Pursue medical certification, treatment, and CPAP records for sleep disorders.
- Pair a reconstructionist with a sleep medicine expert.
- Tie the carrier's knowledge to its hiring, supervision, and health practices.