AI ELD
Mar 27, 2026
Hours of service regulations govern every property-carrying commercial driver operating in interstate commerce. They exist for one reason: fatigue causes crashes, and mandated rest periods reduce fatigue. The rules themselves are found in 49 CFR Part 395, developed and enforced by the Federal Motor Carrier Safety Administration. What follows is a complete, accurate reference covering every rule that applies to property-carrying CMV drivers, including the parts that are most commonly misunderstood and the 2026 regulatory updates that will affect scheduling.
This article covers property-carrying vehicles specifically. Passenger-carrying vehicles operate under a separate ruleset in 49 CFR 395.5 with different limits.
Before reviewing the rules, the threshold matters. A driver must comply with federal HOS regulations if they operate a commercial motor vehicle in interstate commerce and the vehicle weighs 10,001 pounds or more, has a gross vehicle weight rating of 10,001 pounds or more, or is designed or used to transport hazardous materials in quantities requiring placarding.
Interstate commerce is broader than most drivers assume. If cargo crosses a state line at any point in its journey, or if the vehicle is part of a movement that will ultimately involve a state crossing, the trip is considered interstate even if the truck itself never leaves one state. Intrastate-only operations fall under state-level HOS regulations, which most states model closely on the federal framework but which can differ in specific limits.
A driver may not begin driving without first taking 10 consecutive hours off duty. This is the reset that starts a new shift. It must be consecutive, meaning 5 hours off plus 5 more hours off does not satisfy the requirement. The 10 consecutive hours must be uninterrupted. Sleeper berth time can satisfy this requirement, but the 10 hours of sleeper berth time must also be consecutive unless the driver is using the split sleeper berth provision covered below.
A driver may not drive beyond the 14th consecutive hour after coming on duty, following the required 10 consecutive hours off duty. This is often called the 14-hour clock or the driving window. The clock starts the moment the driver begins any on-duty activity: a pre-trip inspection, loading assistance, paperwork, or anything else that is not off-duty or sleeper berth time.
A point that creates consistent compliance problems: the 14-hour window cannot be extended by taking off-duty time during the shift. A driver who goes off duty for two hours at a shipper's dock does not gain two hours on the back end of the window. Those two off-duty hours simply disappear from the shift without extending the clock. The 14-hour limit is a hard wall that starts at the beginning of duty and does not move, regardless of how the time within it is spent.
Within the 14-hour driving window, a driver may drive a maximum of 11 hours total. The 11 hours do not need to be consecutive. A driver can drive 4 hours, take an on-duty break for loading, drive 4 more hours, and still have 3 hours of driving time remaining, provided the 14-hour window has not expired. Driving time accumulates across the shift. The ELD tracks it automatically from the moment the vehicle exceeds the five-miles-per-hour threshold.
These two limits interact in a way that is important to understand: a driver can reach the 11-hour driving limit before the 14-hour window closes, or the 14-hour window can close before the driver has used all 11 available driving hours. Whichever limit is reached first is the effective stopping point. A driver who has driven 11 hours but still has an hour left in the 14-hour window cannot drive further that shift. A driver who hits the 14-hour wall with 3 driving hours remaining loses those hours entirely and must take 10 consecutive hours off before driving again.
After accumulating 8 hours of driving time without at least a 30-minute interruption in driving, the driver must take a break before continuing to drive. The critical clarification from the 2020 HOS rule update: the 8-hour clock counts only actual driving time, not all on-duty time. A driver who drives 4 hours, spends 2 hours on duty at a shipper without driving, and then drives another 4 hours has been on duty for 10 hours but has only driven 8. The break requirement activates based on the driving accumulation.
The break itself can be satisfied by off-duty time, sleeper berth time, on-duty not driving time, or any combination of those statuses, as long as the interruption is at least 30 consecutive minutes. The break does not extend the 14-hour window. Short-haul drivers who qualify for the exceptions under 49 CFR 395.1(e)(1) or (e)(2) are not subject to the 30-minute break requirement.
These are the cumulative limits that govern how much total on-duty time a driver can accumulate before being prohibited from driving further.
The 60-hour/7-day rule applies to motor carriers that do not operate commercial motor vehicles every day of the week. A driver working for one of these carriers cannot drive after having accumulated 60 hours of on-duty time in any period of 7 consecutive days.
The 70-hour/8-day rule applies to motor carriers that operate CMVs every day of the week. A driver for one of these carriers cannot drive after accumulating 70 hours of on-duty time in any period of 8 consecutive days.
The distinction is based on the carrier's operation schedule, not the individual driver's schedule. A driver who personally works 5 days per week but works for a carrier that runs trucks 7 days per week is subject to the 70-hour/8-day cycle.
Important: any compensated work counts as on-duty time, not just driving or motor carrier work. Under the definition of on-duty time in 49 CFR 395.2, performing any compensated work for a person who is not a motor carrier must be included on the log and counted against available hours. A driver who has a second job outside of trucking and receives compensation for that work must log those hours as on-duty time.
A driver who has reached or is approaching the 60 or 70-hour limit has the option to reset the accumulated cycle hours back to zero by taking at least 34 consecutive hours off duty or in the sleeper berth. After the 34-hour period, the driver's cycle clock restarts as if the preceding 7 or 8 days had zero on-duty time.
Two details most articles omit: first, the 34-hour restart is optional, not mandatory. A driver who has not yet hit the cycle limit does not need to take 34 consecutive hours off to continue driving. The restart provision exists as a tool for drivers who need to clear their accumulated hours, not as a required weekly shutdown. Second, the 34-hour break does not need to be taken at the driver's home terminal. It can be taken anywhere, but it must be logged in the time standard of the home terminal location.
The sleeper berth provision under 49 CFR 395.1(g)(1) is available to drivers of vehicles equipped with a compliant sleeper berth as defined in 49 CFR 393.76. It allows drivers to split their required 10-hour off-duty rest into two separate qualifying periods rather than taking it all at once.
To use the split sleeper berth provision, the driver must take one period of at least 7 consecutive hours in the sleeper berth and one period of at least 2 consecutive hours that is off-duty time, sleeper berth time, or a combination of both. The two periods, when paired, must total at least 10 hours. They can be taken in either order.
The most operationally significant feature of this rule: both qualifying periods pause the 14-hour driving window. When the driver is in a qualifying sleeper berth or off-duty period as part of the split, the 14-hour clock stops for the duration of that rest. It resumes when the rest period ends. This means the driver's effective operating window can extend beyond 14 hours in calendar time, even though the actual available driving time within the window remains 11 hours.
The 2020 HOS rule update changed the previous requirement from an 8/2 split to allow a 7/3 split as well. A driver can now take 7 hours in the sleeper berth and 3 hours off duty, or 8 hours in the sleeper berth and 2 hours off duty, or any combination where the sleeper period is at least 7 consecutive hours and the second period is at least 2 consecutive hours and the two together total at least 10.
Vehicle requirement: only drivers operating vehicles equipped with a compliant sleeper berth can use this provision. Day cab trucks, box trucks, and pickup trucks do not qualify even if a driver physically sleeps in the vehicle. The vehicle itself must have a compliant berth under 49 CFR 393.76.
Under 49 CFR 395.1(b)(1), a driver who encounters adverse driving conditions may extend both the 11-hour driving limit and the 14-hour driving window by up to 2 hours. The definition of adverse driving conditions in 49 CFR 395.2 covers snow, ice, sleet, fog, other adverse weather conditions, or unusual road or traffic conditions that were not known and could not reasonably have been known immediately before the driver began the duty day or before beginning driving after a qualifying rest break.
The enforcement boundary most articles miss: the condition must not have been known or reasonably knowable at dispatch. FMCSA guidance is explicit that drivers who are dispatched after the motor carrier has been notified of adverse conditions, or should have known of them, are not eligible for the extension. A carrier that dispatches a driver into a forecast blizzard does not get the benefit of the exception. A driver who encounters an unexpected ice storm after departure does.
When the exception applies, a property-carrying driver can drive up to 13 hours within a maximum 16-hour window. The driver must annotate the use of the exception on the ELD record under 49 CFR 395.28(c). The extension cannot be used to start a new run after the adverse conditions clear. It applies only to completing the current trip or reaching a safe stopping location.
Drivers frequently undercount their on-duty time because they think of it only as time behind the wheel. Under 49 CFR 395.2, on-duty time includes all time spent at a plant, terminal, or facility waiting to be dispatched; all time inspecting or servicing a vehicle; all time driving; all time loading or unloading cargo or supervising those activities; all time spent at a border crossing; time spent providing samples for required testing; and any other work performed for a motor carrier or for any other employer for compensation.
Waiting time at a shipper's dock counts as on-duty time and runs against the 14-hour window, even if the driver is simply sitting in the truck. The only exception is if the driver is fully relieved from all responsibility for the vehicle and its cargo and is free to rest at their own choosing, in which case the time may qualify as off-duty. If the driver remains responsible for the vehicle, it is on-duty time regardless of what the driver is physically doing.
Every minute of the daily cycle is tracked automatically once the driver logs into a compliant ELD. Driving status begins automatically at the five-mile-per-hour threshold. On-duty not driving, off-duty, and sleeper berth statuses require manual selection by the driver. The electronic logbook translates these status records into the shift counters and cycle counters drivers see on-screen.
Dispatchers need to understand one thing that the HOS rules make legally clear: a carrier may not require or permit a driver to drive in violation of these limits. The obligation sits on both the driver and the carrier. A dispatcher who instructs a driver to continue driving after the 14-hour window has closed, or who schedules a run that mathematically requires exceeding the 11-hour limit, has placed the carrier in violation regardless of whether the driver actually complied.
As of spring 2026, the FMCSA is actively pursuing two pilot programs that would modify HOS rules for participating drivers. Both are part of the Department of Transportation's broader effort to provide additional driver flexibility.
The Flexible Sleeper Berth pilot program would expand the available split sleeper berth options from the current 7/3 and 8/2 splits to include 6/4 and 5/5 splits, allowing drivers to divide the required rest into two more equal periods.
The Split Duty Period pilot program would allow participating drivers to pause the 14-hour driving window by up to 3 hours by taking additional off-duty or sleeper berth time at pickup or delivery locations. Both programs are in the data collection phase as of the writing of this article.
Neither of these programs changes the current rules for the general driver population. They are research pilots that require driver enrollment. The current 7/3 and 8/2 split options and the standard 14-hour window remain in effect for all drivers outside the pilot programs.