Federal law limits how many hours a commercial truck driver can spend behind the wheel before resting. When a carrier or driver ignores those limits, the odds of a serious truck accident rise sharply, and the violation itself can become powerful evidence in the claim that follows.
What Are the FMCSA Hours-of-Service Rules?
The Federal Motor Carrier Safety Administration sets hours-of-service rules for property-carrying drivers operating commercial vehicles in interstate commerce. The rules exist because fatigue slows reaction time, impairs judgment, and increases the chance of a catastrophic collision. For a lawyer investigating a crash, the hours-of-service framework is often the first place to look, because a tired driver behind an 80,000-pound rig is a hazard the regulations were written to prevent.
The 11-Hour Driving Limit
A property-carrying driver may drive a maximum of 11 hours after 10 consecutive hours off duty. Once that 11-hour driving limit is reached, the driver must stop driving, regardless of how close the destination is or what a dispatcher wants. This limit caps actual time spent operating the vehicle, separate from other on-duty tasks like loading, inspections, or paperwork.
The 14-Hour On-Duty Window
Driving time is also bound by a 14-hour on-duty window. Once a driver comes on duty after a qualifying rest break, he or she has 14 consecutive hours to complete all driving for that shift. The clock keeps running during fueling stops, loading delays, and traffic, whether or not the truck is moving. A driver cannot pause the 14-hour window to bank hours for later; once it expires, driving must stop until another 10-hour break is taken.
The Required 30-Minute Break
Drivers must take a 30-minute break after 8 cumulative hours of driving time. The break can be satisfied with time off duty, in a sleeper berth, or in some cases with certain non-driving on-duty tasks, but it must interrupt the driving before the 8-hour mark is reached. The purpose is simple: give a fatigued driver a chance to reset before continuing.
The 60/70-Hour Weekly Limits
Beyond the daily limits, drivers face a weekly cap. Depending on whether the motor carrier operates every day of the week, a driver may not drive after accumulating 60 hours on duty in 7 consecutive days, or 70 hours on duty in 8 consecutive days. A driver can restart that weekly clock only after taking 34 or more consecutive hours off duty. These weekly limits are designed to prevent the kind of cumulative exhaustion that builds over a string of long shifts.
How Electronic Logging Devices Enforce the Rules
Most commercial trucks subject to these rules must use an electronic logging device, or ELD, connected to the engine. The ELD automatically records driving time, engine hours, vehicle movement, and location, replacing the paper logbooks drivers once filled out by hand. Because the device pulls data directly from the engine, it is far harder to falsify than a handwritten log. ELD data creates a time-stamped record of exactly when a truck was moving, when it stopped, and how long the driver had been on the road, which makes it one of the most reliable pieces of evidence after a crash involving a commercial vehicle.
Why Economic Pressure Leads to Hours-of-Service Violations
The rules exist precisely because the incentives in trucking push against rest. Drivers are frequently paid by the mile or by the load, not by the hour, so time spent parked is time spent not earning. Carriers face tight delivery windows, penalties for late freight, and pressure from shippers and brokers to keep freight moving. That combination pushes some drivers and carriers to shave minutes off a break, log a rest period that never happened, or keep driving after the 11-hour or 14-hour limit has technically expired. A dispatcher pressing a driver to make one more delivery before the clock runs out is a common pattern behind fatigue-related crashes.
How Log Violations Become Evidence in a Truck Accident Claim
When a crash happens, a truck injury lawyer can request the ELD data, paper logs if any exist, dispatch records, fuel receipts, weigh station records, and the carrier’s own safety files. Comparing what the logs say against what actually happened often exposes gaps: a driver logged as off duty when GPS data shows the truck moving, or a delivery time that could not have been met without exceeding the driving limit. A documented hours-of-service violation does more than show a paperwork problem. It supports an argument that the driver was fatigued at the time of the collision and that the carrier’s scheduling and dispatch practices contributed to the crash, not just the individual driver’s choices. That evidence can shape both liability and the scope of damages sought in the claim.
In Massachusetts, claims arising from a truck collision are generally subject to a three-year statute of limitations under G.L. c. 260, section 2A, which is one more reason to secure logs and electronic data before they are lost or overwritten.
Learn more about how these cases proceed on our pages covering how truck claims are built and why truck cases are different from ordinary passenger vehicle claims, including how these principles apply to a tractor-trailer crash.
Talk to a Truck Injury Lawyer About Hours-of-Service Evidence
Electronic logs and dispatch records do not stay available forever. A truck injury lawyer can send preservation letters and request the underlying data before it disappears. Call 978-347-4400 or request a free case review to discuss what the hours-of-service records in your case may show.