What Are Hours of Service (HOS) Regulations?

The Federal Motor Carrier Safety Administration (FMCSA) — the federal agency that regulates the commercial trucking industry — imposes strict limits on how many hours a commercial truck driver can operate before taking mandatory rest breaks. These rules, known as Hours of Service (HOS) regulations, exist because fatigued driving is one of the leading causes of serious truck accidents.

Driver fatigue impairs reaction time, judgment, and awareness in ways comparable to alcohol impairment. Because a fully loaded semi-truck can take the length of two football fields to stop at highway speeds, even a moment of drowsiness can be catastrophic.

Key Hours of Service Rules for Truck Drivers (Property-Carrying Drivers)

The current FMCSA HOS rules for drivers carrying property (the most common category) include the following limits:

The 11-Hour Driving Limit

A driver may drive a maximum of 11 hours after 10 consecutive hours off duty. Once those 11 hours are used, the driver must take 10 consecutive hours off before driving again.

The 14-Hour On-Duty Window

A driver may not drive beyond the 14th hour after coming on duty, following 10 consecutive hours off duty. Non-driving on-duty time (loading, fueling, inspections) counts toward this window, so if a driver spent 3 hours on administrative tasks before getting in the cab, the 14-hour clock started at the beginning of that shift.

The 30-Minute Break Requirement

Drivers who have driven for 8 cumulative hours without at least a 30-minute interruption must take a break before driving further. The break must be spent off duty or in the sleeper berth.

The 60/70-Hour Weekly Limit

A driver may not drive after having been on duty for 60 hours in 7 consecutive days or 70 hours in 8 consecutive days. A driver can restart this clock by taking 34 or more consecutive hours off duty.

How Electronic Logging Devices (ELDs) Enforce These Rules

As of December 2017, most commercial motor vehicles are required to use Electronic Logging Devices (ELDs) — hardware connected to the truck's engine that automatically records driving time and other data. ELDs replaced paper logbooks, which were routinely falsified.

ELD data is among the most powerful evidence in a trucking accident case. If a driver was operating in violation of HOS rules at the time of the crash, that data can:

  • Prove the driver was legally prohibited from being behind the wheel
  • Establish a pattern of chronic HOS violations suggesting management pressure
  • Support a negligence claim against both the driver and the trucking company

Other Key FMCSA Regulations That Affect Liability

Beyond hours of service, several other federal regulations create standards against which a truck driver or company's conduct can be measured in court:

  • Drug and alcohol testing requirements: Drivers must pass pre-employment, random, post-accident, and reasonable-suspicion drug and alcohol tests. Failure to administer or respond to these tests creates employer liability.
  • Commercial Driver's License (CDL) standards: Drivers must hold a valid CDL appropriate to the vehicle they operate. Employers are required to verify this before hiring.
  • Vehicle inspection and maintenance requirements: Carriers must maintain inspection, repair, and maintenance records for each vehicle. Regular inspections are mandatory, and vehicles with known safety defects must be taken out of service.
  • Weight and cargo securement rules: Overloaded or improperly secured cargo can cause rollovers, lost loads, and brake failures. Federal standards dictate exactly how cargo must be loaded and secured.

How Regulatory Violations Strengthen Your Case

In a trucking accident lawsuit, proving that the driver or company violated an FMCSA regulation at the time of the crash is powerful evidence of negligence. Under the legal doctrine of negligence per se, a violation of a safety regulation designed to protect the public can be treated as automatic proof of negligence — shifting the burden to the defendant to show the violation did not cause the accident.

An experienced trucking accident attorney will investigate all relevant regulatory records — ELD logs, maintenance histories, CDL records, drug test results — to build the strongest possible case on your behalf. Regulatory violations that might seem minor in isolation can paint a clear picture of systemic negligence by a trucking company that prioritized profit over safety.