Trucking Safety Resource Center Arnold & Itkin LLP
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Driver Regulations

Hours of Service Rules

AI

Arnold & Itkin Research Team

Reviewed by Roland Christensen

Hours-of-Service Regulations and Requirements

Federal law limits how long a commercial truck driver can operate before taking mandatory rest. Under Federal Motor Carrier Safety Administration (FMCSA) rules, property-carrying truck drivers may not drive more than 11 hours within a 24-hour period. After reaching that limit, the driver must take a minimum of 10 consecutive hours off duty before getting behind the wheel again.1

Beyond the 11-hour driving cap, there is a separate 14-hour on-duty limit.2 Once a driver comes on duty after a qualifying rest period, that 14-hour clock begins running and cannot be extended, regardless of how many of those hours were spent driving. Time spent on inspection, loading, waiting at a dock, or in any other on-duty status counts toward the window.

Weekly limits also apply. Drivers operating for carriers that run every day of the week cannot exceed 70 hours on duty over any eight consecutive days. Carriers that do not operate every day of the week face a 60-hour limit over seven consecutive days. A driver who has burned through their weekly allotment must take a 34-hour consecutive rest period3 known as a “restart” before that cycle can begin again.

Property-Carrying Driver Limits
11 hours
Maximum driving time within a 24-hour period. Requires a minimum of 10 consecutive hours off duty before driving again.
14 hours
On-duty window limit. Clock starts when the driver comes on duty and cannot be extended regardless of how hours were spent.
60/70 hrs
Weekly on-duty cap: 60 hours over 7 consecutive days (carriers not operating daily) or 70 hours over 8 consecutive days.
34 hours
Consecutive rest required for a weekly restart, resetting the 60- or 70-hour clock.

These are not suggestions. They are codified at 49 C.F.R. Part 395 and enforced by the Federal Motor Carrier Safety Administration. Each limit has a specific regulatory basis, and each violation as a corresponding citation and penalty framework. Understanding which limits apply is essential groundwork for evaluating a crash involving a fatigued driver.

Why Fatigue Is Treated Like Impairment

The federal regulatory framework governing hours of service is built on a substantial body of research showing that fatigue degrades driving performance in measurable, dangerous ways. The comparison of fatigue to alcohol reflects what the research actually shows.

FMCSA’s own research guidance states that being awake for 18 hours is comparable to having a blood alcohol concentration of 0.08 percent, which is the legal limit for impaired driving, and leaves a driver at equal risk for a crash.4

Fatigue and Crash Risk
18 hrs
awake is comparable to a blood alcohol concentration of 0.08 percent
13%
of serious large truck crashes were associated with fatigue (FMCSA and NHTSA Large Truck Crash Causation Study)
The 13% figure is widely understood to be an undercount because fatigue is self-reported in driver interviews.

Fatigue slows a driver’s reaction time. Attention narrows and then drifts. Judgment about speed, following distance, and hazard recognition degrades. Brief periods of unconsciousness lasting only seconds, known as “microsleeps” occur at highway speeds where a second of unawareness can mean hundreds of feet of uncontrolled travel.5

The FMCSA and National Highway Traffic Safety Administration (NHTSA)’s Large Truck Crash Causation Study found that fatigue was associated with approximately 13 percent of serious large truck crashes.6 That figure is widely understood to be an undercount, because fatigue is self-reported in driver interviews and subject to obvious bias when a driver has just been in a crash.

Electronic Logging Device Mandate’s Impact on Evidence

Before 2017, truck drivers were required to record their hours of service by hand in paper logbooks across four categories: off duty, sleeper berth, driving, and on duty not driving. Paper logs were notoriously easy to manipulate. FMCSA studies prior to the Electronic Logging Device (ELD) mandate found that paper logs had an estimated error rate exceeding 30 percent.7

The ELD rule requires that ELDs synchronize with a vehicle’s engine to automatically record driving time, for more accurate hours of service recording. The rule applies to most motor carriers and drivers who are required to maintain records of duty status under 49 C.F.R. § 395.8. Since the full compliance deadline of December 2017, paper logs are only permitted for specific exempted operations and as a short-term emergency backup.8

ELDs capture data the paper log never could:9

What ELDs Capture
GPS location coordinates tied to each duty status change
Engine-on and engine-off events
Odometer readings
Unidentified vehicle movement when no driver is logged in
A timestamped edit history showing every change made to the record

Federal regulations prohibit carriers from altering or erasing original ELD data or source data streams used to generate hours of service records. A carrier that modifies ELD data after a crash commits a federal regulatory violation on top of whatever conduct caused the crash.

Supporting Documents Corroborate the Log

ELD records do not exist in isolation. Federal regulations require carriers to maintain supporting documents for every 24-hour period a driver is on duty10, and those documents are often more valuable than the log itself because a driver cannot reach back and edit them after the fact.

For each 24-hour on-duty period, carriers must retain supporting documents from specific categories:10

Required Supporting Documents
Bills of lading and other trip origin and destination documents
Dispatch records and trip records
Expense receipts
Electronic mobile communication records sent through fleet management systems
Payroll records or settlement sheets showing how the driver was compensated

Fuel receipts are among the most powerful of these documents. A fuel transaction is timestamped, geo-located, and logged by fuel vendors with no incentive to lie. The most reliable way to catch falsified logs is to check them against records the driver has no ability to alter, such as fuel purchase receipts, toll transponder data, and weigh station stops.

The investigative technique is straightforward: corroborate the fuel receipts and toll records against the duty status logs. If the log shows the driver was off duty or in the sleeper berth in one location at a given time, but a fuel receipt places the truck 800 miles away, one of those documents is false. In one documented case, a driver’s record showed off-duty status in Arizona at 9 p.m., but a fuel receipt placed the driver at a different location the following day. Further investigation revealed the records had been shifted back three days, concealing nearly 21 hours of driving time.11

Dispatch communications, such as text messages, electronic load board records, company messaging platform logs, are equally important. They establish what the carrier knew, when it knew it, and what instructions it gave the driver about the load, the schedule, and expected delivery times. A dispatch record showing that a carrier instructed a driver to make a delivery by a time that was only achievable if the driver drove through a required rest period is direct evidence of carrier pressure.

Requirements for Carriers

Responsibility for HOS compliance does not rest on the driver alone. Carriers have independent obligations under federal law, and those obligations create direct liability pathways that do not depend on proving the driver alone was negligent.

When a driver logs into an ELD, federal regulations require the driver to review any unassigned driving time and either claim that time or affirmatively indicate it does not belong to them. Unassigned driving time refers to periods of time when the truck was moving but no driver was logged in. The carrier, in turn, is required to investigate and assign unassigned driving time.12 Carriers that allow unassigned time to accumulate without review are, in practical terms, hiding miles driven and time worked from the regulatory record.

Beyond data management, carriers set the schedules and loads that determine whether a driver can realistically comply with HOS limits. A carrier that books a load requiring 700 miles of driving within a 14-hour window is not merely placing pressure on the driver. It is structuring the job so that compliance is functionally impossible.

Carrier coercion is recognized as a specific category of federal violation. The ELD rule includes anti-harassment provisions specifically designed to prevent carriers from using ELD data to monitor and pressure drivers during rest periods. The existence of those provisions reflects an acknowledged industry pattern

HOS Violations as Evidence of Negligence Per Se

When a crash involves a driver who was over hours, the violation itself carries legal weight that ordinary negligence evidence does not. Most jurisdictions recognize the doctrine of negligence per se: when a defendant violates a safety regulation that was enacted to protect the public from the exact type of harm that occurred, that violation establishes the breach of duty element of negligence without requiring further proof of unreasonableness.13

In truck accident litigation, HOS violations under 49 C.F.R. Part 395 are among the most frequently cited bases for negligence per se claims and can support claims for punitive damages when a carrier knowingly permitted or encouraged the violations.

The logic is direct: Congress and FMCSA enacted hours of service regulations because fatigued driving kills people. A driver who exceeds those limits, and a carrier that permits or encourages it, have violated the specific rule designed to prevent the specific harm that resulted. The plaintiff does not need to separately prove that driving while fatigued was unreasonable because the regulation itself already says so.

Carrier liability in this context extends beyond respondeat superior, which is a legal doctrine imposing vicarious liability onto the employer for the negligence acts or omissions of its employee. When a carrier sets unrealistic schedules; ignores patterns of HOS violations in its fleet’s Compliance, Safety, and Accountability (CSA) data; fails to review ELD records; or maintains a dispatch culture that implicitly rewards running over hours, the carrier faces direct negligence exposure based on its own conduct.

Establishing HOS Violations in Litigation

Establishing an HOS violation in litigation requires more than asking for the driver’s logs. The evidentiary record in a well-developed HOS case is built from multiple corroborating sources that can be checked against each other and against the crash timeline.

The ELD data should be obtained as a native file export so that the underlying source data streams, edit logs, and unidentified driver events are preserved and reviewable. GPS and telematics data from the truck itself, if separate from the ELD system, should be preserved immediately.

Supporting documents must be requested systematically and in full:

Documents to Request Systematically
✓ Fuel receipts for the entire relevant period
✓ Toll records
✓ Weigh station receipts
✓ Bills of lading with delivery timestamps
✓ All dispatch communications including text messages, app-based communications, and electronic load board records

The carrier’s payroll records and settlement sheets for the driver show how the driver was compensated and can reveal whether the pay structure rewarded speed over compliance.

FMCSA tracks HOS compliance data across the industry and hours of service violations have declined since the ELD mandate went into effect.14 But aggregate compliance trends do not tell the story of an individual carrier’s safety culture. FMCSA’s Safety Measurement System (SMS) tracks carriers’ CSA scores across the HOS compliance Behavior Analysis and Safety Improvement Category (BASIC). This data is publicly available at https://ai.fmcsa.dot.gov/SMS and can establish a pattern of violations that preceded the crash. A carrier with a documented history of HOS violations that nonetheless failed to change its practices is a carrier whose management made a choice.

Sources

Frequently Asked Questions

  • Under FMCSA rules, property-carrying truck drivers may not drive more than 11 hours within a 24-hour period. After reaching that limit, the driver must take a minimum of 10 consecutive hours off duty before getting behind the wheel again. Beyond the 11-hour driving cap, there is a separate 14-hour on-duty limit that begins running once a driver comes on duty after a qualifying rest period and cannot be extended. Drivers operating for carriers that run every day of the week cannot exceed 70 hours on duty over any eight consecutive days; carriers that do not operate every day of the week face a 60-hour limit over seven consecutive days.

  • The federal regulatory framework governing hours of service is built on a substantial body of research showing that fatigue degrades driving performance in measurable, dangerous ways. FMCSA’s own research guidance states that being awake for 18 hours is comparable to having a blood alcohol concentration of 0.08 percent, which is the legal limit for impaired driving, and leaves a driver at equal risk for a crash. Fatigue slows a driver’s reaction time. Attention narrows and then drifts. Judgment about speed, following distance, and hazard recognition degrades.

  • The FMCSA and National Highway Traffic Safety Administration (NHTSA)’s Large Truck Crash Causation Study found that fatigue was associated with approximately 13 percent of serious large truck crashes. That figure is widely understood to be an undercount, because fatigue is self-reported in driver interviews and subject to obvious bias when a driver has just been in a crash.

  • Before 2017, truck drivers were required to record their hours of service by hand in paper logbooks. Paper logs were notoriously easy to manipulate. FMCSA studies prior to the Electronic Logging Device (ELD) mandate found that paper logs had an estimated error rate exceeding 30 percent. The ELD rule requires that ELDs synchronize with a vehicle’s engine to automatically record driving time, for more accurate hours of service recording. ELDs capture data the paper log never could, including GPS location coordinates tied to each duty status change, engine-on and engine-off events, and a timestamped edit history showing every change made to the record.

  • Federal regulations require carriers to maintain supporting documents for every 24-hour period a driver is on duty, and those documents are often more valuable than the log itself because a driver cannot reach back and edit them after the fact. Carriers must retain supporting documents from specific categories, including bills of lading and other trip origin and destination documents, dispatch records and trip records, expense receipts, electronic mobile communication records sent through fleet management systems, and payroll records or settlement sheets showing how the driver was compensated. Fuel receipts are among the most powerful of these documents.

  • Most jurisdictions recognize the doctrine of negligence per se: when a defendant violates a safety regulation that was enacted to protect the public from the exact type of harm that occurred, that violation establishes the breach of duty element of negligence without requiring further proof of unreasonableness. In truck accident litigation, HOS violations under 49 C.F.R. Part 395 are among the most frequently cited bases for negligence per se claims and can support claims for punitive damages when a carrier knowingly permitted or encouraged the violations.