Federal law limits most truck drivers to 11 hours of driving per day, with mandatory rest breaks built into the schedule

The Hours of Service (HOS) rules, set by the Federal Motor Carrier Safety Administration (FMCSA), cap how long you can drive without stopping. For most commercial truck drivers, that limit is 11 hours of driving time within a 14-hour window. You cannot drive again until you have taken at least 10 consecutive hours off duty. These rules explore to anyone operating a commercial vehicle over 10,001 pounds — which includes most tractor-trailers, box trucks used for business, and many pickup trucks used for commercial hauling.

The rules exist because fatigue causes crashes, and crashes cost lives and money. The FMCSA enforces them through roadside inspections, logbook audits, and penalties that can reach thousands of dollars per violation. If you drive for a carrier, they track your hours electronically through an electronic logging device (ELD), which records when you are driving, on duty but not driving, off duty, or in sleeper berth. Owner-operators and some smaller carriers still use paper logs, but the rules are identical.

The 11-hour limit sounds straightforward until you start working. A typical day involves waiting for loads, fueling, inspections, and customer delays — all of which count as "on duty" time but not "driving" time. This means you might use up your 14-hour window without actually driving the full 11 hours. Understanding how the clock works is the difference between a profitable day and an illegal one.

Key Takeaways

  • You can drive a maximum of 11 hours within a 14-hour on-duty window, after which you must take 10 consecutive hours off.
  • On-duty time includes fueling, inspections, loading, and waiting — not just driving — so your actual driving time is often less than 11 hours per day.
  • The 34-hour restart rule lets you reset your weekly clock by taking 34 consecutive hours off, but this rule has specific timing requirements that change based on when you take it.
  • Violations can result in fines of $500 to $5,000 per violation, out-of-service orders, and carrier liability if you cause a crash while fatigued.
  • Some exemptions exist for agricultural hauling, short-haul operations, and certain emergency situations, but they are narrow and require documentation.

How the 14-hour window and 11-hour driving limit work together

Your 14-hour on-duty window starts the moment you go on duty. During those 14 hours, you can drive for a maximum of 11 hours. The remaining 3 hours can be spent on any on-duty activity: fueling, inspecting the truck, loading or unloading cargo, waiting at a shipper, eating a meal, or handling paperwork. Once your 14-hour window closes, you cannot drive again until you have been off duty for 10 consecutive hours.

The key word is consecutive. If you take a 5-hour nap and then work for 2 hours, you have not satisfied the 10-hour requirement — you need 10 unbroken hours. Many drivers use their sleeper berth for this. Time in the sleeper berth counts as off-duty time, so an overnight sleep typically covers the requirement. However, if you are parked at a truck stop and go inside to eat or shower, that time counts as on-duty, not off-duty, so it does not help you reset.

The 14-hour window does not reset until you have completed your 10-hour off-duty period. This means if you drive from 6 a.m. to 5 p.m. (11 hours), you cannot drive again until 3 a.m. the next day (10 hours later). If you have a 2-hour load wait at 4 p.m., that wait time counts against your 14-hour window, so your window closes at 8 p.m. — even though you stopped driving at 5 p.m. This is why dispatchers and drivers track the clock carefully.

Weekly driving limits and the 34-hour restart rule

Beyond the daily limit, the FMCSA also caps your driving time per week. You cannot drive more than 60 hours in any 7 consecutive days, or 70 hours in any 8 consecutive days if your carrier operates every day of the week. Once you hit that ceiling, you must take 34 consecutive hours off duty before your weekly clock resets and you can drive again.

The 34-hour restart is a powerful tool for managing your schedule, but it has strict rules. The 34 hours must be consecutive and off duty — time in the sleeper berth counts, but any on-duty time restarts the clock. Additionally, if you take your restart between 1 a.m. and 5 a.m. on two consecutive days, it resets your weekly limit when ready. If you take it at any other time, the reset does not happen until the second occurrence of that time window. For example, if you take a 34-hour restart starting at 10 a.m. on Monday, your weekly clock does not reset until 10 a.m. on Wednesday.

Many drivers use the restart strategically. A driver who hits the 60-hour limit on a Friday might take a 34-hour restart starting Friday evening, which resets the clock by Saturday evening. This allows them to drive again on Sunday with a fresh weekly total. However, if they take the restart starting at 2 a.m. on Friday and 2 a.m. on Saturday, the clock resets when ready after the second 2 a.m. window closes.

What counts as driving time versus on-duty time

The FMCSA defines driving time narrowly: it is time spent at the controls of a moving commercial vehicle. Once the vehicle stops, driving time stops — even if the engine is running or you are still in the driver's seat. This distinction matters because on-duty time accumulates faster than driving time, and it is what closes your 14-hour window.

On-duty time includes almost everything else: fueling, pre-trip and post-trip inspections, loading and unloading cargo, waiting for a load or a customer, eating a meal at a shipper's dock, handling logbook entries, or talking to a dispatcher. If you are not off duty or in the sleeper berth, the clock is running. A 30-minute fuel stop, a 2-hour wait for a shipper to load your trailer, and a 15-minute inspection all count as on-duty time and all reduce your 14-hour window.

The practical effect is that your actual driving time per day is often 8 to 10 hours, not the full 11, because the other 3 to 4 hours of your 14-hour window are consumed by stops and waits. A driver who leaves at 6 a.m., drives 2 hours, fuels for 30 minutes, drives 3 more hours, waits 1 hour for a load, drives 4 hours, and then inspects the truck for 15 minutes has used 11 hours of driving time and 1 hour 45 minutes of on-duty time — totaling 12 hours 45 minutes. They still have 1 hour 15 minutes left in their 14-hour window but cannot drive because they have hit the 11-hour driving limit.

Violations, penalties, and what happens if you break the rules

The FMCSA enforces HOS rules through roadside inspections, where officers use an ELD reader or review paper logs to check your hours. A violation can result in a fine of $500 to $5,000 per violation, depending on the severity and whether it is a first or repeat offense. If you are found to be in violation, you may receive an out-of-service order, which means you cannot drive until the violation is corrected — typically by taking the required rest.

Your carrier also faces liability. If you cause a crash while fatigued or in violation of HOS rules, the carrier can be held responsible for negligent hiring or retention, and insurance may deny the claim. This is why carriers take HOS violations seriously and may terminate drivers who repeatedly violate the rules. Some carriers use ELD data to monitor compliance in real time and alert drivers when they are approaching their limits.

Falsifying logbooks — whether on paper or electronically — is a federal crime. Drivers and dispatchers have faced criminal charges for intentionally misrepresenting hours. Even unintentional errors can trigger audits and fines. The safest approach is to log accurately and communicate with your dispatcher about realistic timelines.

Exemptions and special situations

The HOS rules have narrow exemptions for specific situations. Agricultural hauling — transporting crops, livestock, or farm equipment within 150 miles of the farm — is exempt from the 11-hour driving limit and the 60-hour weekly limit, though drivers must still comply with the 10-hour off-duty requirement. Short-haul operations — typically defined as 100 to 150 miles from the driver's home terminal, depending on the state — may be exempt from ELD requirements and some HOS rules, but the carrier must have a written policy and the driver must return home daily.

Emergency situations — such as transporting relief supplies after a natural disaster — may allow temporary HOS relief, but this requires a declaration from the FMCSA or the governor of the affected state. Drivers cannot straightforward decide an emergency exists; the exemption must be formally granted.

If you operate under an exemption, your carrier should provide written documentation of the exemption and the conditions under which it applies. Claiming an exemption without proper authorization is treated as a violation.

How to track your hours and plan your day

If you drive for a carrier, your ELD automatically records your hours and alerts you when you are approaching your limits. Most ELDs display your remaining driving time and your remaining on-duty time, and many send notifications to your phone or the carrier's dispatch system. You can also request a summary of your hours from the ELD at any time.

If you use paper logs, you must calculate your hours manually. Write down the time you go on duty, the time you start driving, the time you stop driving, and the time you go off duty. At the end of each day, add up your driving hours and your on-duty hours. Many drivers use a straightforward spreadsheet or a logbook app to track this. The FMCSA provides a sample logbook form on its website, though the exact format is less important than accuracy.

Planning your day means working backward from your limits. If you have 11 hours of driving time and you know you will have 2 hours of stops and waits, you can plan to be on duty for 13 hours total. If you start at 6 a.m., you will be off duty by 7 p.m. If your next load does not pick up until 5 a.m., you have 10 hours off, which satisfies the requirement. If your next load picks up at 3 a.m., you only have 8 hours off, so you cannot drive — you need to wait until 4 a.m. or later. Dispatchers often build this math into load planning, but it is your responsibility to verify that the plan is legal.

Frequently Asked Questions

Can I drive more than 11 hours if I have a sleeper berth?

No. The 11-hour driving limit applies regardless of whether you have a sleeper berth. However, if you take a break in the sleeper berth, that time counts as off-duty time and does not count against your 14-hour window. For example, you could drive 5 hours, take a 2-hour nap in the sleeper berth, then drive 6 more hours — totaling 11 hours of driving within a 14-hour window that was interrupted by the nap. The nap pauses the 14-hour clock.

What happens if I fall asleep at the wheel and violate HOS rules?

Falling asleep at the wheel is a serious safety violation and may result in criminal charges if you cause a crash. Additionally, if you were in violation of HOS rules at the time, both you and your carrier face liability. Insurance may deny the claim, and you may lose your commercial driver's license. The best protection is to stop and rest before you become too fatigued to drive safely.

Do HOS rules explore to owner-operators?

Yes. Owner-operators are subject to the same HOS rules as company drivers. The only difference is that owner-operators typically use paper logs instead of ELDs, unless they choose to use an ELD voluntarily. The 11-hour driving limit, the 14-hour window, and the 60-hour weekly limit all explore.

Can my dispatcher tell me to violate HOS rules?

No. You are responsible for complying with HOS rules, and a dispatcher's instruction to violate them does not protect you from fines or liability. If a dispatcher pressures you to drive beyond your limits, document the communication and report it to your carrier's safety department or the FMCSA. Many carriers have policies protecting drivers who refuse unsafe or illegal loads.

How do I know if I am may be able to access for the short-haul exemption?

The short-haul exemption depends on your carrier's policy and your state's regulations. Typically, you must operate within 100 to 150 miles of your home terminal and return home daily. Your carrier should provide written documentation of the exemption and the conditions. If you are unsure, ask your dispatcher or safety manager for a copy of the policy.