Hours of Service Rules: The 14-Hour Clock Is the One That Actually Ends Your Day

Ask a truck driver which HOS rule limits their driving and most will say "11 hours." Ask the same driver what actually forced them to stop on their last trip and most will describe a scenario where the 14-hour on-duty window ran out before they used all 11 driving hours, because they spent 2 hours at the shipper waiting for a dock, 45 minutes fueling and doing a pre-trip, and 30 minutes on a required break. By the time they added up the non-driving on-duty time, they had 7 hours and 45 minutes of actual driving time left in their 14-hour window, not 11.

The 11-hour driving limit gets all the attention. The 14-hour on-duty window is the rule that actually ends most driving days. Understanding how these hours of service rules interact with each other, not just what each one says individually, is the difference between a driver who runs out of clock in a truck stop 50 miles from the delivery and a driver who plans the day correctly.

Here's the 2026 HOS quick reference:

Save that table. It covers every federal HOS rule that applies to property-carrying CMV drivers operating under Part 395 of the Federal Motor Carrier Safety Regulations. Use our HOS rules calculator to run specific scenarios and see exactly how much driving time you have left based on your current duty status.

The 11-Hour Driving Limit: What Everyone Knows

A driver may drive a maximum of 11 hours after 10 consecutive hours off duty.

This is the most straightforward HOS rule. The clock starts when the driver begins driving. It stops when the driver stops driving. On-duty time that isn't driving (loading, unloading, fueling, inspections, paperwork) does not count against the 11-hour driving limit. Only time spent behind the wheel with the truck in gear and moving counts.

The 11-hour limit resets after the driver takes 10 consecutive hours off duty (or completes a qualifying sleeper berth split).

When the 11-Hour Limit Is Actually the Binding Constraint

The 11-hour limit is the rule that ends your day when you have minimal non-driving on-duty time. Long-haul drivers on interstate runs with live loads (no waiting at docks), minimal fueling stops, and efficient trip planning can sometimes use all 11 hours before the 14-hour window expires. This is the ideal scenario from a productivity standpoint.

In practice, it's uncommon. Most drivers accumulate enough non-driving on-duty time through pre-trips, fueling, breaks, dock waits, and paperwork that the 14-hour window closes before they reach 11 hours of driving.

The 14-Hour On-Duty Window: The Rule That Actually Runs the Show

A driver may not drive beyond the 14th hour after coming on duty following 10 consecutive hours off duty. This 14-hour window begins when the driver performs any on-duty activity (including a pre-trip inspection) and runs continuously until it expires. It cannot be paused or extended by taking breaks.

This is the rule most drivers underestimate and the one that causes the most operational friction.

Why the 14-Hour Clock Changes Everything

The 14-hour window includes all time, not just driving time. Every minute spent at a shipper's dock waiting for a load, every fuel stop, every pre-trip inspection, every 30-minute break, every traffic delay where the driver is on duty but not driving, all of it runs the 14-hour clock.

Here's a real-world day that illustrates the interaction:

5:00 AM: Driver starts the day (pre-trip inspection, paperwork). 14-hour window opens. Closes at 7:00 PM.

5:30 AM: Departs terminal. Drives 3 hours.

8:30 AM: Arrives at shipper. Waits 2.5 hours for loading. (On duty, not driving. 14-hour clock is running. Driving clock is paused.)

11:00 AM: Departs shipper. Drives 3 hours.

2:00 PM: Stops for fuel and 30-minute break (required after 6 cumulative hours of driving). 14-hour clock still running.

2:30 PM: Resumes driving. Has used 6 hours of driving time. The 11-hour limit says 5 more hours are available. But the 14-hour window closes at 7:00 PM, which is 4.5 hours away.

The 14-hour window, not the 11-hour limit, determines this driver's day. They have 5 hours of driving time left on the 11-hour clock but only 4.5 hours left on the 14-hour window. The 2.5 hours spent waiting at the dock consumed 14-hour clock time without consuming driving time, and that gap is what shortens the available driving day.

7:00 PM: 14-hour window expires. Driver must stop driving regardless of remaining 11-hour driving time. Total driving: 9.5 hours out of 11 available. 1.5 hours of driving capacity lost to dock time and non-driving activities.

This scenario plays out in some version every day for thousands of drivers. The 14-hour clock is unforgiving because it cannot be paused. Once it starts, it runs to zero whether the driver is driving, sleeping in a dock parking lot, or sitting in traffic.

The 30-Minute Break Requirement

Drivers must take a 30-minute break after accumulating 8 hours of driving time since their last off-duty or sleeper berth period of at least 30 minutes.

The break can be satisfied by either:

• 30 minutes of off-duty time
• 30 minutes of on-duty not driving time (fueling, loading, waiting at a dock)
• 30 minutes of sleeper berth time
• Any combination that totals 30 consecutive minutes of non-driving time

The Practical Detail That Matters

The 30-minute break does not stop the 14-hour clock. It's a mandatory pause in driving, not a pause in the duty day. A driver who takes their 30-minute break at a fuel stop has consumed 30 minutes of their 14-hour window without driving. This is another way the 14-hour window tightens the available driving day.

The strategic approach: satisfy the 30-minute break requirement through activities that would happen anyway (fueling, loading, unloading) rather than taking a separate stop. A 35-minute fuel stop after 7 hours of driving satisfies the break requirement without adding a standalone stop to the day.

The 60/70-Hour Limit: The Weekly Clock

Drivers may not drive after accumulating 60 hours of on-duty time in 7 consecutive days (for carriers that don't operate every day) or 70 hours of on-duty time in 8 consecutive days (for carriers that operate daily).

This is the weekly limit, and it works differently from the daily limits. The 60/70-hour clock counts all on-duty time, not just driving time. Loading, unloading, fueling, inspections, and administrative tasks all count against the weekly limit.

Which Limit Applies

The carrier chooses whether to operate on a 7-day or 8-day cycle. Most for-hire carriers use the 8-day/70-hour cycle because it allows more total on-duty time per week.

The cycle is rolling, not calendar-based. Under the 8-day/70-hour rule, the system looks back at the most recent 8 consecutive days. Each day, the oldest day drops off and the current day is added. If a driver worked 10 hours of on-duty time 8 days ago and that day drops off the window, those 10 hours become available again.

The 34-Hour Restart Option

Drivers can reset their 60/70-hour clock to zero by taking 34 consecutive hours off duty that include two periods between 1:00 AM and 5:00 AM.

The restart is optional. Drivers who can manage their weekly hours without a full restart may choose to keep the rolling cycle going. The restart is most useful when a driver's rolling 60/70-hour accumulation is approaching the limit and they need a full reset rather than waiting for individual days to drop off.

The Sleeper Berth Exception: Splitting the Required 10 Hours

Drivers are normally required to take 10 consecutive hours off duty before starting a new driving window. The sleeper berth exception allows drivers to split this rest period into two segments:

7/3 split: 7 hours in the sleeper berth and 3 hours either in the sleeper berth or off duty. The 7-hour period pauses the 14-hour clock. The 3-hour period does not.

8/2 split: 8 hours in the sleeper berth and 2 hours either in the sleeper berth or off duty. The 8-hour period pauses the 14-hour clock. The 2-hour period does not.

When the Split Makes Sense

The sleeper berth exception is primarily useful for team drivers and for drivers who want to maximize productivity on multi-day trips. By splitting rest, a driver can effectively extend their available driving hours across a 24-hour period.

The complexity: calculating available driving time under a split sleeper berth scenario requires tracking which portions of the split have been completed and how the 14-hour window interacts with each segment. This is where ELDs earn their keep, because the calculations are nearly impossible to do accurately by hand under real driving conditions.

How These Rules Interact: The 3 Scenarios Dispatchers Get Wrong

Scenario 1: The Dock Wait That Kills the Day

Setup: Driver has a 600-mile run. At 55 mph average, that's roughly 10.9 hours of driving. Fits within the 11-hour limit.

Reality: The shipper takes 3 hours to load. The driver now has 14 minus 3 minus pre-trip time minus break time = approximately 10 hours of available window for driving. The 600-mile run no longer fits in one day.

The lesson: Dispatch planning that calculates transit time based solely on the 11-hour driving limit without accounting for dock time, fuel stops, and break requirements will consistently produce plans that don't fit within the 14-hour window.

Scenario 2: The Break That Doesn't Count

Setup: A driver has been driving for 7 hours and 45 minutes. They know they need a 30-minute break before reaching 8 hours. They pull off at a rest area and sit in the cab for 25 minutes checking their phone, then get fuel for 10 minutes.

Reality: If the 25 minutes in the cab was logged as on-duty not driving (which it should be if the driver was available and not in the sleeper berth), only the pattern of non-driving time matters. The break requirement is 30 consecutive minutes of non-driving time. The 25 minutes at the rest area plus 10 minutes fueling might or might not satisfy the requirement depending on how it was logged and whether the segments were consecutive.

The lesson: Satisfy the break requirement cleanly. A single, clear 30-minute block logged as off-duty or on-duty not driving eliminates any ambiguity.

Scenario 3: The Weekly Clock Surprise

Setup: A driver has been running hard all week. It's Thursday. They've accumulated 65 hours of on-duty time over the last 7 days on a 70-hour/8-day cycle. They have 5 hours available.

Reality: The driver starts the day expecting to drive 5 more hours. But Thursday's on-duty time from 8 days ago (which is about to drop off the rolling window) was only 2 hours, not the 8 or 9 hours the driver assumed. The rolling recalculation only frees up 2 hours, not enough for the planned run.

The lesson: The 60/70-hour clock requires tracking exactly how many hours drop off each day, not estimating. ELDs calculate this automatically, but drivers and dispatchers who don't understand the rolling mechanism can be surprised by how little time is actually available.

HOS Rules and BASIC Scores: The Connection

HOS violations from roadside inspections feed directly into the HOS Compliance BASIC, which has an intervention threshold of 65%. Since the ELD mandate took full effect, HOS violations detected during inspections almost always reflect actual driving-time exceedances rather than paperwork errors, which means an elevated HOS BASIC in 2026 is a meaningful safety signal.

Common HOS violations that carry high severity weights:

• Driving beyond the 11-hour limit (severity 7)
• Driving beyond the 14-hour window (severity 7)
• No valid ELD records (severity 5)
• Violating the 30-minute break requirement (severity 4)
• Exceeding the 60/70-hour limit (severity 7)

For carriers: check your HOS-related violation history with our inspection history tool, which shows each violation with its severity weight and whether it resulted in an out-of-service order. For the full breakdown of how violations feed into BASIC percentiles, read our BASIC scores guide.

For brokers: an elevated HOS Compliance BASIC on a carrier you're considering should prompt a look at whether the violations are operational (the carrier's dispatch planning creates pressure to violate) or isolated (one driver on one bad day). Read our CSA score guide for how to evaluate BASIC scores in context.

Frequently Asked Questions

What are the current hours of service rules for truck drivers?

Property-carrying CMV drivers operating in interstate commerce must follow these limits: 11 hours maximum driving after 10 hours off duty, all driving within a 14-hour on-duty window that cannot be paused, a 30-minute break after 8 hours of driving, and no driving after 60 hours on duty in 7 days or 70 hours in 8 days. A 34-hour restart option resets the weekly clock.

How does the 14-hour rule work in trucking?

The 14-hour rule starts a non-pausable clock the moment a driver begins any on-duty activity after 10 consecutive hours off duty. All driving must occur within this 14-hour window. Once the window expires, the driver cannot drive again until they take another 10 consecutive hours off duty. The clock runs regardless of what the driver is doing: driving, loading, fueling, waiting, or sitting in traffic.

Can you pause the 14-hour clock?

Under normal operations, no. The 14-hour clock runs continuously once it starts and cannot be paused by taking breaks or going off duty. The only exception is the sleeper berth split: a 7-hour (or 8-hour) period in the sleeper berth pauses the 14-hour clock for the duration of that rest period.

What is the 30-minute break rule for truck drivers?

After accumulating 8 hours of driving time, a driver must take at least 30 consecutive minutes of non-driving time before driving again. The break can be off-duty, on-duty not driving (fueling, loading), or sleeper berth time. The break does not pause the 14-hour on-duty window.

How does the 70-hour rule work?

Under the 70-hour/8-day rule, a driver cannot drive after accumulating 70 hours of on-duty time in any consecutive 8-day period. The calculation is rolling: each day, the oldest day in the 8-day window drops off and the current day is added. Drivers can reset the 70-hour clock to zero by taking 34 consecutive hours off duty that include two periods between 1:00 AM and 5:00 AM.

Do HOS rules apply to local drivers?

Federal HOS rules apply to drivers of commercial motor vehicles operating in interstate commerce. Drivers who operate exclusively within a single state may be subject to state-specific HOS rules, which can differ from federal rules. The short-haul exception allows drivers who operate within a 150 air-mile radius of their reporting location and return to that location within 14 hours to be exempt from the ELD requirement and some record-keeping requirements, but the driving and on-duty limits still apply.

How do ELDs affect hours of service?

ELDs (electronic logging devices) automatically record driving time, on-duty time, and off-duty time. They replaced paper logbooks for most commercial drivers in 2019. ELDs don't change the HOS rules themselves, but they make it significantly harder to falsify records. A high HOS Compliance BASIC score in the ELD era is a stronger safety signal than the same score was in the paper logbook era because the data quality is fundamentally better.

What happens if a truck driver violates HOS rules?

During a roadside inspection, an HOS violation can result in the driver being placed out of service (prohibited from driving until they've completed the required rest period). The violation is recorded on the carrier's FMCSA record and feeds into their HOS Compliance BASIC score. Repeated or severe HOS violations can trigger FMCSA enforcement action including targeted inspections and compliance reviews.

Bottom Line

The driver who ran out of clock 50 miles from the delivery didn't violate the 11-hour driving limit. They lost 2.5 hours of their 14-hour window to a dock wait that nobody planned for. The 11-hour limit gets the headline. The 14-hour window writes the schedule. Plan for both, because the rule that ends most driving days is the one that runs whether you're driving or not.