Fatigue is one of the deadliest factors in commercial truck accidents. The Federal Motor Carrier Safety Administration (FMCSA) Hours of Service (HOS) regulations exist specifically to prevent fatigued driving — and when trucking companies violate these rules, they hand accident victims powerful evidence of negligence that can dramatically increase settlement values.
Understanding HOS rules and how violations affect your case is crucial knowledge for anyone injured by a commercial truck driver.
The Core FMCSA Hours of Service Rules
The FMCSA's HOS regulations govern how long commercial drivers can operate their vehicles before mandatory rest. The key rules for property-carrying commercial motor vehicle (CMV) drivers are:
11-Hour Driving Limit: A driver may drive a maximum of 11 hours after 10 consecutive hours off duty. This is the fundamental limit, and exceeding it — even by one hour — constitutes a violation.
14-Hour On-Duty Window: A driver may not drive beyond the 14th consecutive hour after coming on duty, following 10 hours off. Even if a driver has hours remaining on the 11-hour driving clock, once the 14-hour window closes, they must stop. The window cannot be extended by taking breaks during the day.
30-Minute Rest Break: Drivers must take a 30-minute break after driving 8 cumulative hours without at least a 30-minute interruption. This break must be taken before the driver resumes driving.
70-Hour/8-Day Limit: Drivers operating for carriers running vehicles every day of the week cannot drive after 70 on-duty hours in 8 consecutive days. This prevents the accumulation of a massive fatigue debt over an extended work week.
10-Hour Off-Duty Requirement: Before resuming driving, a driver must take at least 10 consecutive hours off duty. No amount of scheduling pressure from a dispatcher can legally override this requirement.
Electronic Logging Devices (ELDs)
Since December 2017, most commercial carriers have been required to use Electronic Logging Devices (ELDs) — electronic systems that automatically record driving time, engine hours, vehicle movement, and location data. ELDs replaced paper logbooks that were notoriously easy to falsify.
ELD data is extraordinarily valuable evidence in litigation. When a driver exceeds HOS limits, the ELD creates an electronic record that is very difficult to manipulate without forensic detection. Your attorney can subpoena ELD records, and any discrepancy between ELD data and the driver's own account of events is devastating to the defense.
What HOS Violations Mean for Your Case
When an investigation reveals that the truck driver who injured you was in violation of HOS rules at the time of the crash, several important things happen to your case:
Negligence per se. In many jurisdictions, violating a safety regulation like FMCSA HOS rules constitutes negligence per se — meaning you don't have to prove the driver was unreasonably negligent. The regulatory violation is itself evidence of breach of duty.
Opening the door to punitive damages. When a trucking company knowingly allows or pressures drivers to exceed HOS limits — through dispatch practices, delivery deadlines, or deliberate under-staffing — courts can award punitive damages far beyond compensatory amounts. Plaintiffs' attorneys routinely seek internal dispatch records, text messages, and emails that show the company's culture around HOS compliance.
Pressure on the insurer to settle. Insurance adjusters are well aware that HOS violations in discovery substantially weaken their defense. Documented violations often trigger larger, faster settlement offers because the carrier's attorney knows jury exposure is significant.
How Your Attorney Obtains Log Records
Obtaining driver log records requires prompt action. Your attorney will send an immediate litigation hold letter to the carrier demanding preservation of all ELD data, paper logs (if any), dispatch records, communication logs, and GPS tracking data. Federal regulations require carriers to retain records for a minimum of 6 months, but accidents and litigation create obligations to preserve longer. If records are destroyed after a legal preservation demand, courts can impose spoliation sanctions — including instructing a jury to presume the missing evidence was harmful to the defense — which can be the most powerful tool in the case.