Hours-of-Service Rules (Commercial Trucking)

Federal limits on how long a commercial driver may drive and work, and the electronic records that show whether those limits were kept.

Looking for a lawyer rather than a definition? Skip to the state-by-state list of Trucking Accident law firms.

What it means

Federal regulation caps the driving and on-duty time of commercial motor vehicle drivers, requires minimum off-duty periods, and limits hours over a rolling multi-day window. The purpose is fatigue reduction, and the rules apply to the carrier as well as the driver - a carrier may not permit or require driving beyond the limits.

What makes the rules matter outside the industry is the record-keeping. Most drivers subject to them must log duty status electronically rather than on paper, and carriers must retain supporting documents. Those records, together with vehicle telematics and inspection reports, are objective evidence of what a driver was doing in the hours before a crash - which is a very different evidentiary position from an ordinary collision between two private cars.

The rules are detailed and carry numerous exceptions by cargo type, distance traveled and adverse conditions, so whether a particular driver was subject to a particular limit is itself frequently a contested question rather than a given.

For property-carrying drivers, the core limits are stated in hours: no more than 11 hours of driving after a qualifying off-duty period, no driving after the 14th hour on duty, and a required break after 8 hours of cumulative driving (49 C.F.R. § 395.3(a)). A separate weekly-style limit counts on-duty hours across a rolling multi-day period (§ 395.3(b)). Passenger carriers follow a different set of limits in § 395.5. Exceptions include a short-haul exception for drivers who stay within a set radius and return to their work location (§ 395.1(e)), and a limited extension for adverse driving conditions that could not have been known at dispatch (§ 395.1(b)). Carriers must keep each driver's records of duty status and supporting documents for a fixed retention period (§ 395.8(k)).

Where this comes from

When people hire a lawyer for this

Where a commercial vehicle is involved, the evidentiary window is short and it is the reason to act early rather than the severity of the injury: electronic logs and supporting documents are subject to defined retention periods, after which routine deletion is lawful. A formal request to preserve them is ordinarily the first step, and it has to be made before the retention period runs rather than after.

Worried about the cost? A lawyer can be hired for one part of a case only (limited-scope representation), may be paid from what a claim recovers (contingency fee), or may be free through a pro bono program or legal aid; a court can also waive its own filing fees.

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Related terms

Other entries in the same area of law, each written from the same primary sources.

• CDL DisqualificationThe federally defined list of offenses that take away a commercial driver's license - including offenses committed in a personal car, and a lower alcohol limit than applies to other drivers.
• Contesting a Traffic TicketWhat a moving violation citation actually is, the difference between an infraction and a traffic misdemeanor, and the procedures - hearing, written defense, traffic school - for answering one.
• Driving Record PointsThe system most states use to score moving violations against a driver's record, with a license suspension when the total crosses a threshold - and an interstate compact that makes an out-of-state ticket count at home.
• DUI / DWI (Impaired Driving)Driving while impaired by alcohol or drugs - a charge that almost always runs as two separate cases at once, one criminal and one over the license.
• Event Data Recorder (Vehicle Black Box) EvidenceThe crash data a modern vehicle records about itself in the moments before an impact - what the federal standard requires it to capture, who owns it, and who may retrieve it.
• Field Sobriety TestsThe roadside balance, coordination and eye-movement exercises an officer uses to build probable cause for an impaired-driving arrest - usually voluntary, and never the same thing as the chemical test that follows.
• Ignition Interlock DeviceA breath-testing device wired into a vehicle that stops it starting if the driver has been drinking - required by many states after an impaired-driving conviction as a condition of driving at all.
• Implied Consent and Administrative License SuspensionThe rule in every state that by driving you have agreed to a chemical test for alcohol or drugs after a lawful arrest - and the license suspension that follows a refusal or a failed test, separately from any criminal case.
• Leaving the Scene of an Accident (Hit and Run)The legal duties every state imposes on a driver involved in a crash - to stop, to exchange information and to help anyone hurt - and the separate criminal offense of driving away instead.
• Lemon Law and Warranty RightsRules that entitle a buyer to a refund or replacement when a new vehicle has a defect the manufacturer cannot fix in a reasonable number of attempts.
• Negligent Entrustment (Lending a Vehicle)The claim against a person who lent a car to someone they knew, or should have known, was unfit to drive it - the owner's own negligence, separate from the driver's.
• No-Fault Car InsuranceA system in which your own insurer pays your medical bills after a crash regardless of who caused it - used in a minority of states, and it limits when you can sue.
• Odometer Fraud and the Odometer DisclosureRolling back or replacing an odometer to hide a vehicle's true mileage is a federal offense, and every transfer of a vehicle must come with a written mileage statement the buyer can sue over if it is false.
• Permissive Use (Insurance Follows the Car)Which policy pays when someone drives a borrowed car with the owner's permission - the omnibus clause, the exclusions that defeat it, and the owner-liability statutes some states add.
• Policy LimitsThe maximum an insurance policy will pay - and usually the real ceiling on what a claim is worth, whatever the injury.
• Rideshare Accident Insurance (App Periods)Which insurance applies when a rideshare vehicle is in a crash depends on what the driver's app was doing at that moment - the three periods state transportation network company laws define, and the gap that personal policies leave.
• Salvage and Rebuilt TitlesThe title brands a state applies to a vehicle an insurer has declared a total loss, what a rebuilt brand means, and the federal database built to stop a branded title being washed clean in another state.
• SR-22 and Financial Responsibility FilingsThe certificate an insurer files with the state to prove a high-risk driver is carrying the required liability coverage - what triggers it, why it is not itself insurance, and what happens if the policy behind it lapses.
• Tire Defect Claims (Tread Separation and Blowouts)Injury claims after a tire fails, where the question is whether the tire was defectively made or designed, was too old or was recalled, rather than only how the driver reacted.
• Total Loss and Diminished ValueWhat happens when an insurer decides a damaged vehicle is not worth repairing - and the separate claim for a repaired car that is now worth less.
• Uninsured and Underinsured Motorist CoverageCoverage on your own policy that pays when the driver who hurt you had no insurance, or nowhere near enough - and it is the coverage people most often discover they declined.
• Used Car Buyers Guide (FTC Used Car Rule)The window sticker a dealer must display on every used vehicle offered for sale, stating whether it comes with a dealer warranty or as is - and why the sticker overrides the contract.
• Vehicle Safety RecallA manufacturer's federally supervised obligation to notify owners of a safety defect and fix it free of charge - and the rules on what a dealer may sell with a recall still open.

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