Federal Trucking Hours of Service Rules
The FMCSA’s hours of service regulations exist for one reason: to keep fatigued truck drivers off the road. When carriers ignore those limits, the consequences land on everyone else. Know what the rules require — and when they were broken.
The Federal Motor Carrier Safety Administration’s hours of service (HOS) regulations — found at 49 CFR Part 395 — set strict limits on how long a commercial truck driver can drive and work before taking required rest. A driver who has been on the road for 10 or 11 hours is statistically as impaired as a drunk driver — but the carrier is still moving freight, still paying per mile, and in too many cases, still pressuring drivers to keep rolling. When an HOS violation contributes to a crash, it is not just a paperwork problem. It is direct evidence of negligence — by the driver and by the company that sent them out.
The Hours of Service Limits — What Federal Law Requires
The current HOS rules for property-carrying commercial drivers set four main limits:
FMCSA Hours of Service Limits — 49 CFR Part 395
- 11-Hour Driving Limit: A driver may not drive more than 11 hours after 10 consecutive hours off duty
- 14-Hour On-Duty Window: A driver may not drive beyond the 14th consecutive hour after coming on duty — time spent on non-driving tasks counts toward this limit
- 30-Minute Rest Break: After 8 consecutive hours of driving, the driver must take at least 30 minutes off duty before continuing
- 60/70-Hour Weekly Limit: Drivers cannot drive after accumulating 60 hours on duty in any 7 consecutive days, or 70 hours in any 8 consecutive days
- 34-Hour Restart: Drivers can reset the weekly clock with at least 34 consecutive hours off duty
- Sleeper Berth Split: Drivers using a sleeper berth may split the required 10-hour off-duty period — at least 7 consecutive hours in the berth, plus at least 2 consecutive hours off duty or in the berth
What Electronic Logging Devices Record — and Why It Matters
Since December 2017, the FMCSA has required most commercial drivers to use Electronic Logging Devices (ELDs). ELDs sync automatically with the truck’s engine — recording every change in duty status in real time, based on actual engine activity. Unlike the paper logs that drivers once filled out manually, ELD data is difficult to falsify and far harder to “lose.”
After a crash, ELD data is among the first evidence our team preserves. It can show:
- Whether the driver was within legal driving hours at the time of impact
- How long the driver had been on duty without required rest
- Whether required breaks were actually taken or skipped
- Whether the carrier’s dispatch records match the driver’s actual logged time
- Prior HOS violations in the days or weeks before the crash
This data must be preserved with a legal hold notice — sent immediately. Once a truck returns to service, ELD data can be overwritten. Our team sends preservation letters on day one. See our full breakdown of trucking crash evidence for what else we collect.
Why Carriers Violate Hours of Service Rules
HOS violations are not random. They are systemic — created by carrier cultures that prioritize throughput over compliance. The most common drivers of violations:
- Unrealistic delivery schedules — dispatchers setting timelines that cannot be met within legal hours, creating implicit pressure to skip rest breaks
- Per-mile pay structures — drivers paid only for miles driven, not for time spent waiting at docks or stuck in traffic, incentivizing driving beyond legal limits to make up lost revenue
- Traffic and weather delays — drivers who fall behind schedule due to conditions outside their control face pressure from dispatch to “make it up”
- Lack of available parking and rest facilities — a documented FMCSA-identified problem that forces drivers to drive past safe stopping points to reach legal parking
When a carrier’s management knew or should have known that its schedule required HOS violations, the carrier’s independent liability goes beyond respondeat superior. That’s the kind of systemic failure that can support a punitive damages claim in Kentucky courts.
Fatigued Driving — What the Research Shows
The FMCSA Large Truck Crash Causation Study identified driver fatigue as a factor in a significant portion of large truck crashes. Critically, fatigue was not just a contributing factor — in many cases it was the critical reason for the crash. The NHTSA reports that being awake for 18 consecutive hours produces impairment comparable to a blood alcohol level of 0.05%. At 24 hours awake, impairment matches 0.10% BAC — above the legal limit for any driver.
Drowsy driving looks like distracted driving from the outside. A fatigued driver drifts in their lane, fails to brake in time, and misjudges gaps in traffic. In a crash investigation, the difference between fatigue and inattention matters — ELD data and driver logs are often the only way to establish fatigue as the root cause, which is why preserving that evidence immediately is so critical.
HOS Violations and Your Injury Claim
In a civil case, proving a driver was over their HOS limit at the time of a crash does several things at once. It establishes that the driver was operating in violation of a federal safety regulation. It creates an inference that the driver was impaired by fatigue. And it exposes the carrier to independent liability for allowing the violation to occur — especially when prior violations appear in the same driver’s ELD history.
Our team pairs HOS violation evidence with the full picture of trucking negligence: driver qualification files, maintenance records, prior FMCSA safety ratings, and the carrier’s history with DOT out-of-service violations. The pattern matters — because carriers that repeatedly violate HOS rules do so knowingly.
Frequently Asked Questions
What are the federal hours of service limits for truck drivers?
Under 49 CFR Part 395, property-carrying commercial drivers are limited to 11 hours of driving within a 14-hour on-duty window, after 10 consecutive hours off duty. A 30-minute rest break is required after 8 consecutive hours of driving. Weekly limits cap on-duty time at 60 hours in 7 days or 70 hours in 8 days. Violating any of these limits while driving is an FMCSA violation that can be used as evidence of negligence in a civil case.
How does an ELD prove an hours of service violation?
Electronic Logging Devices automatically record a driver’s duty status — driving, on-duty not driving, off-duty, and sleeper berth — by syncing with the truck’s engine. The data is timestamped and tamper-resistant. After a crash, ELD records can show whether the driver was over their driving limit, had skipped required rest breaks, or had accumulated violations in the days before the crash. This data must be preserved before the truck returns to service and the records are overwritten.
Can the trucking company be sued for an hours of service violation, not just the driver?
Yes — and in many fatigue cases, the carrier’s conduct is more significant than the driver’s. Carriers that set unrealistic schedules, use per-mile pay structures that incentivize overdriving, or have a history of dispatching drivers past their legal limits face independent liability beyond respondeat superior. When the carrier’s conduct shows a pattern of conscious disregard for safety, Kentucky law may allow punitive damages.
What is the 14-hour rule and how is it different from the 11-hour driving limit?
The 11-hour limit caps actual driving time. The 14-hour rule caps the total on-duty window — driving plus all other work, including loading, fueling, and waiting at docks. Once 14 hours have elapsed since coming on duty, the driver may not drive again until completing 10 consecutive hours off duty. Even if a driver has only used 8 of their 11 driving hours, the 14-hour clock still runs out when it runs out. Both limits must be met simultaneously.
What happens to a driver who violates hours of service rules?
An HOS violation subjects a driver to FMCSA civil penalties, roadside out-of-service orders, and potential CDL disqualification for egregious violations. In a civil injury case, the violation is evidence of negligence. In cases where the violation was extreme or the carrier had prior notice of the problem, it may support a claim for punitive damages against the carrier. The driver’s entire HOS history — not just the day of the crash — becomes relevant evidence.
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