Federal Trucking Safety Regulations

Purpose of the Regulations

FMCSA’s mission is to reduce accidents, injuries, and deaths involving large trucks and buses. The regulations address hazards such as fatigue, impairment, unqualified drivers, unsafe equipment, and poorly secured cargo.

A trucking company has an active role in keeping its operations safe. The regulations place responsibilities on the people who hire, supervise, train, assign, and dispatch drivers, and on those who inspect and maintain equipment.

The framework has three connected parts: operating standards, records showing how the business follows those standards, and government oversight. A maintenance rule sets the obligation. A repair record documents the work. An inspection or investigation tests whether the motor carrier’s practices meet the requirement.

Common Trucking Industry Safety Terms

Principal Regulations by Part

Driver Qualification

Before assigning a driver, the trucking company must satisfy the qualification requirements in Part 391. Those requirements address driving history, medical eligibility, and the records supporting the hiring decision.

The driver qualification file documents whether the motor carrier completed the required process. Missing inquiries or incomplete records can reveal gaps in how the company selected and reviewed its drivers.

Hours-of-Service Limits

For ordinary property-carrying operations, 49 CFR 395.3 sets these limits:

• A driver may drive up to 11 hours after 10 consecutive hours off duty.
• Driving must stop by the end of the 14th consecutive hour after coming on duty.
• After eight cumulative driving hours without a qualifying interruption, the driver needs a 30-minute interruption in driving. That period may be on duty if the driver is not driving.
• A driver may not drive after reaching 60 or 70 on-duty hours in seven or eight consecutive days, depending on the operation.
• A qualifying 34-hour off-duty period can restart the seven-day or eight-day calculation.

The 14-hour limit concerns the driving window. A driver may perform other work after that window closes. Passenger operations, sleeper-berth provisions, adverse conditions, and qualifying exceptions require separate review under the applicable hours-of-service provisions.

Fatigue also has its own operating rule. Section 392.3 prohibits operation when fatigue, illness, or another cause impairs, or is likely to impair, the driver’s ability to operate safely. Staying within a time limit does not settle whether the driver was fit to drive.

Vehicle Maintenance Requirements

Together, Part 393 and Part 396 let an investigation examine the vehicle’s condition and the process used to keep it safe.

A brake problem, for example, raises questions about the condition of the brake, earlier inspections, reported defects, and repairs. Section 396.3 requires systematic maintenance and specified records for covered vehicles.

Drug and Alcohol Testing

Covered CDL operations carry the added drug and alcohol requirements in Part 382 and Part 40.

The Drug and Alcohol Clearinghouse holds CDL drivers’ drug and alcohol program violation information. Its role is different from the databases used to review a trucking company’s inspections and accidents.

FMCSR Vehicle Thresholds

Meeting any one threshold makes a vehicle used in interstate commerce a commercial motor vehicle under 49 CFR 390.5.

Smaller Regulated Vehicles

A box truck, delivery vehicle, or pickup pulling a trailer can fall within the federal safety rules. For a pickup and trailer, the combination’s weight can establish coverage, so the truck’s weight alone can give the wrong answer.

Safety Coverage Versus Commercial Driver’s License Requirements

A driver can operate a federally regulated commercial vehicle without needing a commercial driver’s license. General safety coverage can begin at 10,001 pounds. The principal weight-based CDL thresholds in Part 383 begin at 26,001 pounds, with additional conditions for vehicle combinations and separate triggers for passengers and hazardous materials.

In-State Trips in Interstate Commerce

A truck may remain inside one state while carrying freight that is part of an interstate shipment. The interstate commerce definition includes certain movements within a state that originate or terminate outside that state.

Private Carriers

A business transporting its own products can qualify as a private motor carrier. A manufacturer’s delivery fleet may therefore have safety obligations even though the business earns its revenue from selling products.

Contractor status also requires care. The regulatory definition of employee includes an independent contractor while operating a commercial motor vehicle, which brings the contractor within the safety regulations. Separate employment and civil liability questions require their own analysis.

Exceptions

An exception can apply to one obligation and not another. A qualifying short-haul driver may receive relief from certain logging requirements while remaining subject to driving and duty limits.

For an operation conducted entirely within one state, check that state’s motor carrier rules separately. The federal interstate coverage test does not resolve the full state-law analysis.

Federal Oversight and Enforcement

Federal oversight combines roadside enforcement, motor carrier records, accident reports, audits, and investigations.

• Roadside inspections examine the driver, vehicle, and applicable operating requirements.
• State-reported accident information enters the federal safety monitoring system.
• Trucking company investigations review records and safety management practices.
• New-entrant audits examine whether a new motor carrier has basic safety controls.
• The Safety Measurement System (SMS) uses inspection, accident, and investigation data to prioritize trucking companies for enforcement.

A roadside inspection violation can affect the motor carrier’s safety data even when no accident occurred.

Carrier Identification

The USDOT number is a central identifier in federal motor carrier safety records. The SAFER Company Snapshot allows searches by USDOT number, MC or MX number, or company name.

Operating authority is a separate question. Review the trucking company’s identity and its authority or insurance status independently through FMCSA’s registration resources.

Equipment ownership can introduce another layer. The company operating the shipment may use leased equipment. Maintenance record requirements account for vehicles furnished by someone other than the motor carrier. Identify the operating trucking company, tractor owner, and trailer owner separately when reviewing the records.

In this context, tracking means linking a trucking company to safety events and compliance records. The public systems provide records and summaries rather than a live map of truck locations.

BASIC Safety Categories

SMS sorts its data into seven Behavior Analysis and Safety Improvement Categories, called BASICs:

• Unsafe Driving
• Hours-of-Service Compliance
• Driver Fitness
• Alcohol and Controlled Substances
• Vehicle Maintenance
• Hazardous Materials Compliance
• Crash Indicator

SMS uses the preceding 24 months of roadside inspection and accident data, together with investigation information, and updates monthly.

SMS compares motor carriers within defined groups and gives greater weight to more recent events.

The Crash Indicator and Hazardous Materials Compliance BASIC results are not public, and the displayed data alone is not a basis for conclusions about a motor carrier’s overall safety condition.

Formal Safety Ratings

A formal safety rating evaluates the trucking company’s safety management controls. It is different from an SMS measure or percentile.

Check the date of the rating and review recent safety events separately. A historical rating and current inspection information describe different periods in the motor carrier’s operation.

New-Carrier Oversight

The New Entrant Safety Assurance Program monitors a new motor carrier for 18 months. FMCSA conducts a safety audit within 12 months after operations begin, and monitoring continues through the rest of the new-entrant period.

A new-entrant safety audit evaluates basic safety controls. A rated trucking company investigation can produce a formal safety rating under Part 385. These reviews serve different purposes.

Enforcement Consequences

Depending on the violation and the applicable process, violations can lead to written warnings, fines, civil penalties, and suspension of operating authority.

An out-of-service action can concern a driver, a vehicle, or the motor carrier’s operations. Read the actual order or inspection report to determine who or what was restricted and what had to happen before operations could resume.

Safety Issues and Related Records

Whether a particular record establishes a violation or supports a liability finding depends on the facts and applicable law.

Accident Records

The federal accident definition covers an occurrence involving a commercial motor vehicle on a highway that results in a fatality, an injury treated immediately away from the scene, or disabling damage that requires a vehicle to be towed or carried away from the scene.

An accident appearing in the federal data does not establish who caused it, because qualifying accident involvement is collected regardless of the trucking company’s or driver’s role. Read the underlying accident records before making statements about fault.

Record Retention Periods

Driver duty records have the shortest minimum period. After six months, the federal retention requirement for them ends, so a preservation request for those records should go out early.

Frequently Asked Questions