Hours of service rules are the federal limits on how long you can drive and work before you have to rest, and the big three are the 11-hour driving limit, the 14-hour on-duty window, and the 70-hour, 8-day cap. They come from the FMCSA, they apply to most property-carrying commercial drivers, and getting them wrong can cost you a violation, a load, or your safety.
If you run a truck for a living, these numbers rule your day whether you like them or not. The good news is they are not that hard once you see how they fit together. Below we break down each clock in plain terms, run real numeric examples, and show the common mistakes that shut drivers down short of the yard.
Key Takeaways
- The 11-hour rule caps driving; the 14-hour rule caps your total on-duty window; the 70-hour rule caps your work across a rolling 8 days. You must stay legal on all three at once.
- The 14-hour window does not stop for breaks, fuel, or loading. Only a qualifying sleeper-berth split can pause it.
- Ten hours off resets your 11 and your 14, but it does not reset your 70. Only a 34-hour restart clears the weekly cap.
- You owe a 30-minute break before your 8th cumulative hour of driving, and it can be off-duty, sleeper, or on-duty not-driving time.
- Rules change over time, so confirm current limits at fmcsa.dot.gov or with a compliance professional before you rely on any figure.
- Exceptions exist (short-haul, adverse driving, the 16-hour exception), and each has strict conditions attached.
The three clocks you are always running
Think of hours of service as three separate clocks ticking at the same time. You have to stay legal on all three, not just one. When any single clock runs out, that part of your day is done even if the others still have time left.
| Clock | The limit | What resets it |
|---|---|---|
| Driving | 11 hours of driving | 10 consecutive hours off duty |
| On-duty window | 14 hours from when you start | 10 consecutive hours off duty |
| Weekly on duty | 70 hours in 8 days (or 60 in 7) | A 34-hour restart |
The trick most new owner-operators miss is that these clocks do not all reset the same way. Ten hours off gives you a fresh 11 and a fresh 14. It does not wipe out your 70. Only a proper restart does that.
A useful habit is to ask, before you turn the key, which clock is your weakest today. Some days the 14-hour window is tight because of a slow dock. Other days you have plenty of window but you are bumping against your 70. The clock with the least time left is the one that decides when you shut down.
The 11-hour driving limit
After you take 10 hours off in a row, you can drive up to 11 hours. That is actual driving time, not total work. Once you hit 11 hours behind the wheel, you cannot drive again until you get another 10 hours off.
This one is straightforward. Where folks get tripped up is thinking the 11 hours has to be all in one stretch. It does not. You can drive 5 hours, do a delivery, drive 3 more, take lunch, and finish your last 3. As long as your total driving stays at or under 11, and you are still inside your 14-hour window, you are fine.
Here is a worked example. Say you average 55 to 60 mph over a run once you account for terrain, traffic, and slow zones. Eleven hours of driving then covers roughly 600 to 660 miles in a legal day, assuming your 14-hour window does not run out first. On a mountain route where your average drops to 45 to 50 mph, the same 11 hours might only cover 500 to 550 miles. Your driving limit is fixed in hours, but the miles it buys you swing with the road.
The 14-hour window
Here is the one that catches people. Once you come on duty after your 10 hours off, a 14-hour clock starts and it does not stop. You have 14 hours to get all your driving done. After that, you are out of driving time for the day, period, even if you have not used up all 11 driving hours.
The window keeps running no matter what you are doing:
- Waiting to get loaded or unloaded
- Fueling up
- Grabbing a meal
- Doing a pre-trip inspection
- Taking your 30-minute break
That is why a long wait at a shipper can eat your whole day. If you sit four hours at a dock, that is four hours gone off your 14, and you never turned a wheel. Watching this clock is the difference between finishing a run and shutting down 30 miles short.
Walk through the arithmetic. You go on duty at 6:00 a.m., so your window closes at 8:00 p.m. A 30-minute pre-trip, a 4-hour dock wait, a 30-minute fuel-and-break stop, and a 30-minute delivery add up to 5.5 hours of non-driving on-duty time. That leaves only 8.5 hours inside the window for driving, even though the 11-hour limit would otherwise let you drive more. In that case the 14-hour window, not the 11-hour limit, is what ends your driving day. You lost 2.5 hours of drive time to a slow dock.
The main way to pause the 14 is a qualifying sleeper-berth split, which lets you set aside a chunk of time that does not count against the window. Sleeper-berth math gets its own set of rules, so learn it carefully before you lean on it.
The 30-minute break
Once you have driven for 8 hours without at least a 30-minute break, you have to take one before you drive again. It can be off-duty time, sleeper time, or on-duty not-driving time. The point is 30 straight minutes where you are not driving.
A lot of drivers just line this break up with a fuel stop or lunch so it does not cost them extra time. That is smart planning. The break itself is simple. The mistake is forgetting about it and getting pinged for driving past the 8-hour cumulative mark.
Note the word cumulative. The 8 hours is total driving time, not clock time. If you drive 4 hours in the morning, spend 2 hours at a delivery, then drive again, your break clock picks up where it left off. You owe the 30 minutes before your driving total crosses 8 hours, whenever that lands on the clock.
The 70-hour and 60-hour weekly limits
The last clock is the long game. It caps how much total on-duty time you can rack up over a rolling stretch of days.
| Limit | Who uses it | The rolling period |
|---|---|---|
| 70 hours | Carriers running every day of the week | Any 8 days in a row |
| 60 hours | Carriers not running every day | Any 7 days in a row |
Notice these count all on-duty time, not just driving. Loading, paperwork, inspections, and waiting all add up here too. Because the period rolls, hours drop off the back end as new days come on. On the 8th day, the hours you worked 8 days ago free back up.
Here is how the rolling math plays out on a 70/8 schedule. Suppose you log 11, 12, 10, 13, 11, 9, and 4 on-duty hours across seven days, which totals 70. On day 8 you are at the cap and cannot start until hours roll off. But once day 1 (your 11-hour day) drops out of the 8-day window, those 11 hours free back up and you have room to work again. This is why drivers who front-load big days early in the week often feel squeezed at the end of it.
When you get close to the cap, a 34-hour restart clears it. Take 34 consecutive hours off duty and your weekly clock goes back to zero. Many owner-operators build their week around a solid restart so they roll into the next week fresh.
Exceptions worth knowing
The three core clocks cover most days, but the FMCSA carves out a handful of exceptions that can change how your day runs. Each one has strict conditions, and leaning on an exception you do not actually qualify for is itself a violation. Treat the table below as a map of what exists, then verify the current terms at fmcsa.dot.gov before you use one.
| Exception | What it does | The catch |
|---|---|---|
| Short-haul | Can waive the ELD and 30-minute break if you stay within an air-mile radius and return to your start | You must report and return to the same location inside a set time and distance |
| Adverse driving | Can extend driving and the window when weather or traffic you could not have known about slows you down | It does not cover delays you could have planned around, like a known dock backup |
| 16-hour | Once a week, can extend the 14-hour window for certain non-commercial-radius drivers | Tight eligibility rules, and you cannot stack it with a restart in a way that abuses it |
The short-haul exception is the one most local and regional drivers touch, because it can free them from carrying an ELD and from logging the 30-minute break. Even so, blow past the radius or the return time and you snap back under the full rules for that day, retroactively. The adverse driving exception is widely misunderstood: it is for surprises, not for a route you already knew would be slow. If you knew the pass was closing or the receiver runs three hours behind, that is planning, not adversity.
The safe way to think about exceptions is that they are narrow tools, not loopholes. Know which one your operation actually qualifies for, log it correctly, and confirm the current conditions before you rely on it. When in doubt, run the day under the standard 11, 14, and 70 and you cannot go wrong.
How it all works together on a real day
Say you sleep 10 hours, then come on at 6:00 a.m. Your 14-hour window runs until 8:00 p.m. You have 11 hours of driving to spend inside it and a 30-minute break to fit in before your 8th hour of driving. You also need enough room left on your 70 to cover the whole shift. If any one of those runs dry, that clock wins.
Put numbers on it. You drive 6:00 to 11:00 a.m. (5 hours), sit 2 hours at a receiver, drive 11:00… make that 1:00 to 3:30 p.m. (2.5 hours, now at 7.5 cumulative), take a 30-minute break paired with fuel, then drive 4:00 to 7:00 p.m. (3 more hours). That is 10.5 driving hours used, you are inside the 8:00 p.m. window, and your break landed before hour 8. Legal on all counts, with a thin 30-minute cushion on the window. Lose an hour to traffic and that cushion is gone.
Running the numbers in your head at 4:00 a.m. is how mistakes happen. It is a lot easier to punch your start time and hours into a tool and let it tell you when each clock runs out. Our hours-of-service calculator does that so you can plan your day before you leave the yard.
Common mistakes drivers make
These are the errors that turn a legal plan into a violation or a shutdown short of the destination.
- Treating 10 hours off as a full reset. It refreshes your 11 and 14, not your 70. Drivers who forget this run out of weekly hours mid-week and get stranded.
- Assuming the 14-hour window pauses for breaks. It does not, outside a qualifying sleeper split. Every dock wait, fuel stop, and meal burns window time you cannot get back.
- Forgetting the break is on cumulative driving. The 30 minutes is owed before 8 hours of driving, not 8 hours on the clock. Splitting your day does not delay the break.
- Planning to the last legal minute. No buffer means a single dock delay or traffic jam pushes you into a violation or an unplanned shutdown. Build in slack.
- Trusting the ELD screen without knowing the rules. ELDs mislog duty status sometimes, especially around personal conveyance and yard moves. If you cannot spot an error, you cannot fix it before it counts against you.
- Switching between the 70/8 and 60/7 without authority. Your carrier is set up for one. You cannot flip to whichever gives you more hours on a given day.
A few things to keep straight
- Your ELD tracks this for you, but you are still responsible. Know the rules well enough to catch an error, not just trust the screen.
- There are exceptions. Short-haul, adverse driving conditions, and the 16-hour exception can change your day. Each has its own conditions, and misusing one is itself a violation.
- Rules change. The FMCSA updates hours-of-service regulations from time to time, so always confirm the current version at fmcsa.dot.gov or with a compliance professional before you rely on it.
The bottom line
The 11, the 14, and the 70 are the three numbers that shape every working day you run. Eleven hours to drive, fourteen hours to get it done, seventy hours a week before you have to rest hard. Keep a 30-minute break in there and know how your restart works, and you have got the core of it.
Plan your clocks before you roll, not after you are already tight. When you are figuring out whether a load pencils out for your week, run it through the hours-of-service calculator alongside your fuel and mileage numbers. If the run crosses state lines, keep your IFTA fuel tax records lined up the same way, because compliance is cheaper than a fine. Legal keeps you rolling.