DOT Hours of Service (HOS) Rules and Regulations

The trucking industry keeps America’s economy moving—but long hours behind the wheel can take a serious toll on driver safety. That’s why DOT Hours of Service (HOS) regulations exist. These federal rules set clear limits on driving time, on-duty hours, and mandatory rest breaks to reduce fatigue, prevent accidents, and promote safer highways for everyone.

HOS regulations are enforced by the Federal Motor Carrier Safety Administration (FMCSA), a division of the U.S. Department of Transportation (DOT). They apply to most commercial motor vehicle (CMV) drivers, including those operating vehicles over 10,001 pounds, transporting placarded hazardous materials, or carrying passengers above regulated limits. By defining when drivers can work—and when they must rest—the rules help ensure drivers remain alert, focused, and fit to operate safely.

Because HOS regulations are periodically updated, staying informed is essential for both drivers and motor carriers. Compliance not only protects road safety but also impacts CSA scores, safety ratings, and overall business operations. 

In this guide, we’ll break down the key components of DOT Hours of Service rules—from daily driving limits and required 30-minute breaks to weekly hour caps. 

What are DOT Hours of Service (HOS) rules?

The DOT hours of service (HOS) rules are federal safety regulations that control how long drivers can be on duty, how many hours they can drive, and when mandatory rest breaks are required. These FMCSA hours of service rules, issued under 49 CFR Part 395, apply to most commercial motor vehicle (CMV) operators.

At their core, HOS regulations are designed to prevent driver fatigue—one of the leading causes of truck accidents. By setting strict limits on daily driving time, weekly work hours, and required off-duty periods, the rules help ensure drivers remain alert, focused, and capable of operating safely on the road.

The federal hours-of-service regulations are a set of safety-related requirements that describe: 

• How many hours a driver is allowed to drive in a single shift
• The length of the on-duty window
• When a 30-minute break is required
• Weekly driving limits under the 60/70-hour rule
• The minimum off-duty time required before starting a new shift

The DOT hours of service rules set clear boundaries around when driving must stop and rest must begin.

HOS rules also require most drivers to use an Electronic Logging Device (ELD) to accurately record driving time and duty status. ELDs automatically track hours, helping drivers and carriers maintain compliance and avoid violations, with limited exceptions for certain operations.

What’s the purpose of the FMCSA Hours of Service regulations and rules?

The primary purpose of DOT Hours of Service (HOS) rules is to enhance road safety by preventing driver fatigue, a leading cause of commercial vehicle accidents. The Federal Motor Carrier Safety Administration (FMCSA) enforces these rules to ensure drivers take mandatory rest breaks and maintain alertness throughout their shifts.

According to DOT estimates, driver fatigue contributes to over 8,000 truck-related accidents annually. The National Highway Traffic Safety Administration (NHTSA) also reports that roughly two million people are injured in motor vehicle accidents each year, with about 65% occurring during long trips. By setting clear limits on daily driving time, weekly work hours, and required off-duty periods, the hours of service rules for truck drivers are designed to reduce these risks. When drivers follow structured rest schedules, they remain more alert, focused, and responsive to road conditions.

Electronic Logging Devices (ELDs) play a key role in supporting HOS compliance. Installed in trucks, ELDs automatically track driving time and duty status, helping drivers follow mandated rest periods and allowing fleets to monitor compliance efficiently.

Who is subject to Hours of Service regulations?

DOT Hours of Service (HOS) regulations apply to most drivers and motor carriers operating commercial motor vehicles (CMVs) in the United States. Both U.S.-based drivers and international carriers from Canada or Mexico must comply when operating within the U.S.

HOS rules apply when a vehicle meets the federal definition of a Commercial Motor Vehicle (CMV). A vehicle qualifies as a CMV if it meets any one of the following conditions, whether or not it has a trailer attached:

• Weighs more than 10,001 pounds (including any load)
• Has a Gross Vehicle Weight Rating (GVWR) or Gross Combination Weight Rating (GCWR) of 10,001 pounds or more
• Transports hazardous materials in a quantity that requires DOT placards
• Is designed or used to transport 16 or more passengers, including the driver, not for compensation
• Is designed or used to transport 9 or more passengers, including the driver, for compensation

HOS regulations primarily apply to interstate commerce, which includes crossing state lines or transporting goods as part of interstate trade. Many states also adopt similar or identical rules for intrastate commerce; therefore, drivers operating within a single state should verify their local requirements.

When do the Hours of Service regulations apply?

DOT Hours of Service (HOS) regulations apply based on the type of commerce a driver engages in and the cargo being transported. Knowing when these hours of service rules apply is essential to staying compliant and avoiding violations.

Interstate commerce

Interstate commerce involves transporting goods, passengers, or services across state lines. If you operate in interstate commerce, you must follow all federal FMCSA hours of service rules.

Importantly, you do not have to physically cross a state line for the regulations to apply. If the load you are hauling is part of interstate trade, the federal HOS regulations apply to you. This includes both company drivers and independent contractors.

If you stop performing interstate operations, you must continue complying with federal DOT hours of service rules for at least seven consecutive days after your last interstate trip.

Intrastate commerce

Intrastate commerce occurs entirely within the borders of a single state. Federal HOS regulations do not apply to drivers operating solely in intrastate commerce. However, each state may establish its own HOS rules, and drivers must follow those state-specific regulations—for example, the Texas Transportation Code for Texas drivers.

An important exception exists for drivers transporting hazardous materials in quantities requiring placards. HOS rules apply regardless of whether the operation is interstate or intrastate. Even if a Hazmat vehicle is not actively carrying a load, the driver must comply with federal HOS regulations.

DOT Hours of Service (HOS) rules and regulations

DOT Hours of Service (HOS) regulations set clear limits on driving, on-duty hours, and mandatory rest periods for commercial drivers. These rules, enforced by the Federal Motor Carrier Safety Administration, are designed to prevent fatigue, enhance road safety, and ensure drivers remain alert behind the wheel. 

Here’s a comprehensive overview of the key HOS provisions for property-carrying commercial drivers.

11-hour HOS rule – driving limit

The 11-hour driving limit allows a property-carrying driver to operate a commercial vehicle for up to 11 total hours after taking 10 consecutive hours off duty. This rule ensures drivers begin each shift properly rested and helps reduce fatigue-related crashes.

Drivers must complete those 11 driving hours within their 14-hour on-duty window. They can split the driving time into segments throughout the shift, taking breaks or performing other on-duty tasks in between. However, once a driver reaches the full 11 hours of driving time, they must stop driving and take another qualifying 10-hour off-duty period before resuming driving.

Only time spent actively driving counts toward the 11-hour limit. Other on-duty activities—such as loading, unloading, fueling, inspections, or paperwork—do not count against driving time, although they do count toward the 14-hour duty window. Short breaks during the shift do not extend the 11-hour maximum; they simply pause driving time while the 14-hour clock continues to run.

14-hour HOS rule on-duty limit

The DOT 14-hour rule sets the maximum on-duty window for property-carrying drivers. After taking 10 consecutive hours off duty, a driver cannot drive beyond the 14th consecutive hour after coming on duty.

The 14-hour window includes:

• Driving time
• On-duty, not driving (loading, unloading, inspections, fueling, paperwork)
• Short breaks or off-duty periods taken during the shift

Once the 14-hour clock starts, it runs continuously. It does not pause for meal breaks, fuel stops, loading delays, inspections, naps, or short off-duty periods. Unless you qualify for the split sleeper berth provision, the clock keeps moving.

In most cases, any off-duty period shorter than 10 consecutive hours still counts toward the 14-hour limit. Within that 14-hour window, drivers may drive up to a maximum of 11 hours. However, once the 14th hour passes, driving must stop—even if you still have unused driving time remaining under the 11-hour rule.

To drive again, you must complete another 10 consecutive hours off duty. The HOS 14-hour rule exists to prevent drivers from stretching their workday indefinitely. 

30-minute rest break requirement

The 30-minute break rule requires drivers to take a minimum 30 consecutive-minute break after 8 cumulative hours of driving without interruption. Once a driver reaches eight hours of driving time, they must stop driving until they complete the required break.

This break does not have to be logged as off duty. Drivers may satisfy the requirement by logging:

• Off-duty time
• Sleeper berth time
• On-duty, not driving time

A combination of non-driving activities totaling 30 consecutive minutes (for example, 10 minutes off duty + 20 minutes on duty, not driving). The key requirement is that the driver performs no driving during those 30 consecutive minutes.

Drivers may continue performing non-driving duties after reaching eight hours without immediately taking a break, but they cannot resume driving until they complete the 30-minute interruption. It is also important to note that this break does not pause the 14-hour on-duty window; the 14-hour clock continues to run.

60/70-hour weekly limit HOS rule

In addition to daily driving limits, the FMCSA enforces weekly caps on total on-duty time to prevent cumulative fatigue. These limits restrict how many hours a driver may work over a rolling seven- or eight-day period.

• 60 hours in 7 consecutive days applies to carriers that do not operate vehicles every day of the week.
• 70 hours in 8 consecutive days applies to carriers that operate vehicles daily.

All on-duty time counts toward this limit—including driving and on-duty, not-driving tasks. To remain compliant with DOT hours of service rules, drivers must track every hour worked, not just time behind the wheel.

Once you reach the applicable 60- or 70-hour limit, you cannot drive again until your total on-duty hours fall below the maximum. Because the calculation uses a rolling period, hours “drop off” as they move outside the 7- or 8-day window.

34-Hour restart

The 34-hour restart gives drivers a full rest period to reset their weekly on-duty limits. By taking 34 consecutive hours off duty, drivers can reset the 60-hour limit for a 7-day schedule or the 70-hour limit for an 8-day schedule.

After completing a 34-hour restart, drivers begin a fresh weekly cycle, with their available hours returning to zero. This allows them to resume driving within daily HOS limits until they reach the weekly maximum again. The restart typically includes at least two nights of rest, helping drivers recover fully and maintain a healthier work-rest balance.

Drivers can use the 34-hour restart at any point in their schedule, making it a flexible tool to manage weekly driving limits while ensuring adequate recovery.

Sleeper berth and split rest HOS rule

The split sleeper berth rule gives drivers flexibility in managing their mandatory rest periods while staying compliant with Hours of Service (HOS) regulations. Instead of taking one continuous 10-hour off-duty period, drivers can divide their rest into two separate segments, provided the total adds up to at least 10 hours.

For property-carrying drivers, the breakdown is:

• One period of at least 7 consecutive hours must be spent in the sleeper berth.
• The second period must be at least 2 consecutive hours, either off duty or in the sleeper berth.

For passenger-carrying drivers using sleeper berths:

• One period of at least 8 consecutive hours must be in the sleeper berth.
• The second period can be at least 2 consecutive hours, either in the berth or off duty.

Combined, the two periods must total at least 10 hours.

This provision allows drivers to take rest at convenient times without disrupting delivery schedules. Importantly, neither of the split periods counts against the 14-hour on-duty window, offering drivers the ability to extend driving flexibility between rest breaks. However, the 14-hour clock resets only after completing a full 10-hour off-duty period.

HOS regulations: How many hours are you allowed to drive in a day?

The following summarizes the key HOS rules for property-carrying and passenger-carrying commercial drivers:

DOT Hours of Service (HOS) exemptions and exceptions

The DOT Hours of Service (HOS) rules include specific exemptions and flexibilities to accommodate certain operational circumstances. These exceptions allow drivers to operate safely while providing practical relief from standard regulations.

1. Short-haul HOS exemptions

Drivers who operate within a 150 air-mile radius of their normal work reporting location and complete their workday within a 14-hour duty window may qualify for short-haul exemptions. These drivers:

• Are not required to take the mandatory 30-minute rest break after eight hours of driving.
• May extend their duty day to 16 hours under the 16-hour short-haul exception, provided:
  • They start and end their shift at the same location.
  • They complete the extended shift within 16 hours after a 10-hour off-duty period.
  • They have not used this exception during the previous six consecutive workdays, or they have completed a 34-hour restart.
• Are not required to maintain a detailed log or use an Electronic Logging Device (ELD), although the carrier must record the driver’s daily start and end times and total hours worked, retaining records for six months.

Short-haul exemptions also apply to non-CDL drivers with slightly adjusted criteria, including limits on consecutive 14-hour and 16-hour workdays within seven days.

2. Adverse driving conditions exception

Drivers may extend their driving and duty limits by up to 2 hours when encountering unforeseen or adverse conditions such as:

• Severe weather (snow, ice, fog, sleet)
• Unexpected traffic shutdowns or road closures

To qualify, the driver or carrier could not reasonably have anticipated the conditions at the start of the trip or after a qualifying rest period. This exception does not cover predictable delays, such as rush-hour traffic, detention, breakdowns, loading, or unloading.

3. Sleeper berth flexibility

Drivers may split their required 10-hour off-duty period into two separate segments:

• One period must be at least 7 consecutive hours in the sleeper berth.
• The other period must be at least 2 consecutive hours, either off duty or in the sleeper berth.
• Combined, the two periods must total at least 10 hours.

When used correctly, split-sleeper periods do not count against the 14-hour duty window, and the order of the breaks does not matter. This flexibility allows drivers to rest without affecting compliance or delivery schedules.

4. Emergency conditions

During federally or state-declared emergencies, HOS rules may be temporarily suspended for drivers directly involved in relief efforts, such as transporting essential goods, emergency personnel, or aid supplies. These exemptions generally apply only to drivers operating within or to the affected regions.

5. Agricultural exemption

Drivers transporting agricultural commodities during planting or harvesting seasons may be exempt from certain HOS requirements when operating within 150 air miles of the source. This provides additional flexibility during peak agricultural periods.

6. Industry-specific exceptions

• Oil transport / wait-at-well: Drivers transporting oil or waiting at oil well sites may count waiting time as off-duty or use it toward the 30-minute break requirement.
• Sales drivers: Drivers who are also sales people are exempt from the 60-hour/7-day and 70-hour/8-day weekly limits.

Most common Hours of Service (HOS) violations

Several HOS violations frequently occur among commercial drivers. The most common include:

• Exceeding the 14-hour on-duty limit: Driving or working beyond the maximum daily on-duty window.
• Surpassing weekly driving limits: Operating more than 60 hours in 7 days or 70 hours in an 8-day cycle.
• Exceeding the 11-Hour driving limit: Driving longer than allowed after completing the required off-duty rest period.
• Failing to maintain records of duty status (RODS): Not documenting driving, on-duty, or off-duty hours accurately.
• Falsifying logs: Intentionally submitting incorrect hours to appear compliant.
• Operating without the correct license class: Driving a vehicle that requires a different CDL classification than the one held.

HOS violations can be detected through several channels. Employers actively monitor drivers’ hours to ensure internal compliance and may identify violations during routine tracking. Law enforcement officers can catch violations during roadside inspections or traffic stops, while random audits and weigh station checks conducted by the DOT can uncover non-compliance. Additionally, if a driver is involved in an accident while exceeding HOS limits, investigators may flag the violation as part of the review. These multiple oversight mechanisms help ensure that drivers adhere to Hours of Service regulations and maintain road safety.

What are the fines and penalties for violating Hours of Service (HOS) rules?

Violating Hours of Service (HOS) regulations can result in severe consequences for both drivers and carriers, ranging from fines to career-impacting penalties.

Driver consequences

• Out-of-service orders: Drivers may be placed out of service at roadside until they have completed sufficient off-duty time to comply with HOS regulations.
• Fines: State or local authorities can issue fines, and the Federal Motor Carrier Safety Administration (FMCSA) can impose civil penalties ranging from $1,000 to $16,000 per violation, depending on severity. These amounts are periodically adjusted for inflation under the Federal Civil Penalties Inflation Adjustment Act Improvements Act of 2015.
• Compliance, Safety, Accountability (CSA) points: Violations can add points to a driver’s CSA score, affecting overall safety ratings and employability.
• Criminal liability: Drivers who knowingly and willfully falsify logs or violate HOS rules may face federal criminal charges, including fines, license suspension, or jail time.
• Career impact: Serious or repeated HOS violations can impact a driver’s reputation, reduce hiring opportunities, and potentially lead to the loss of their Commercial Driver’s License (CDL).

Carrier consequences

• Civil penalties: Carriers can be fined between $1,000 and $16,000 per violation for allowing drivers to operate outside HOS regulations.
• Safety rating downgrades: A pattern of violations can lower a carrier’s FMCSA safety rating, which may affect contracts, insurance, and business reputation.
• Criminal liability: Carriers that knowingly or willfully require drivers to violate HOS rules may face federal criminal charges, including fines, operational restrictions, or legal action.
• Insurance costs: Frequent violations can increase insurance premiums, impacting operational costs.

Operational considerations

Drivers and carriers must plan for potential downtime due to inspections, especially during high-enforcement periods. This may require:

• Adding buffer time to load and trip schedules to account for inspection delays.
• Performing thorough pre-trip inspections and scheduling maintenance proactively to prevent HOS-related violations.

Why HOS compliance matters

Hours of Service (HOS) regulations may seem complex at first, but they serve a clear and critical purpose: preventing driver fatigue and protecting on-road public interest. These rules establish maximum driving hours and required rest periods to promote safety, accountability, and professionalism across the trucking industry.

By understanding HOS requirements and planning trips carefully, drivers can maximize productivity while staying compliant. Successful drivers recognize that compliance is not just about avoiding violations—it reflects professionalism, responsibility, and commitment to safety.

Staying informed about HOS updates is equally important, as the FMCSA periodically adjusts regulations based on safety data and industry feedback. In today’s regulated transportation environment, long-term success depends not only on driving skill but also on a strong understanding of compliance. Drivers and carriers who prioritize HOS compliance protect their careers, their businesses, and the safety of everyone on the road.