The driver qualification rules in 49 CFR Part 391 set the minimum standards a person must meet to drive a commercial motor vehicle for a motor carrier in interstate commerce, and they set the records a carrier must keep to prove it. In short: the driver has to be at least 21, hold a single valid CDL, read and speak English, pass a federal medical exam, and be free of any disqualifying offense; the carrier has to verify all of that in writing and keep the file current.
Who Part 391 Applies To
Part 391 reaches anyone who drives a commercial motor vehicle for, on behalf of, or as a motor carrier.1eCFR. 49 CFR 391.1 – Scope of the Rules in This Part A “commercial motor vehicle” is defined in 49 CFR 390.5 as a highway vehicle used in interstate commerce that meets any one of four tests:
- A gross vehicle weight rating, gross combination weight rating, or actual gross weight of 10,001 pounds or more.
- Designed or used to carry more than 8 passengers, including the driver, for compensation.
- Designed or used to carry more than 15 passengers, including the driver, without compensation.
- Used to haul hazardous materials in quantities requiring placards.
The phrase “including the driver” changes the arithmetic. A 9-seat van used for paid transport is a CMV because the driver counts as one of the nine.2eCFR. 49 CFR 390.5 – Definitions
Interstate commerce is the trigger for federal application. That includes any trip crossing a state line and any load that originated in, or is bound for, another state, even if the driver personally never leaves home. One interstate load is enough to pull that driver under Part 391 for the assignment. Many states adopt the same standards for intrastate work, so the practical reach is often broader than “interstate only” suggests.
The Six Minimum Qualifications
Section 391.11 sets the baseline every interstate CMV driver must meet before the carrier lets them drive:3eCFR. 49 CFR 391.11 – General Qualifications of Drivers
- At least 21 years old.
- Able to read and speak English well enough to understand highway signs, respond to official inquiries, and complete required records.
- Holds a current commercial motor vehicle operator’s license issued by only one state.
- Medically certified as physically qualified under Part 391.
- Not disqualified under § 391.15.
- Able to safely operate the specific vehicle type the carrier is assigning, whether that is a set of doubles, a tanker, or a passenger bus.
The obligation is mutual. A motor carrier cannot require or allow anyone to drive a CMV unless the driver meets every one of these six items.3eCFR. 49 CFR 391.11 – General Qualifications of Drivers
Medical Certification
Every driver covered by Part 391 must be physically qualified and must carry the original or a copy of a current Medical Examiner’s Certificate while on duty.4eCFR. 49 CFR 391.41 – Physical Qualifications for Drivers The exam must be performed by a medical examiner on the FMCSA National Registry of Certified Medical Examiners; a licensed ophthalmologist or optometrist may perform the vision portion separately.5eCFR. 49 CFR 391.43 – Medical Examination; Certificate of Physical Examination
Core Physical Standards
Section 391.41(b) sets specific benchmarks the examiner checks against. The most commonly relevant are:
- Distant visual acuity of at least 20/40 (Snellen) in each eye, with or without corrective lenses, a horizontal field of vision of at least 70 degrees in each eye, and the ability to recognize standard red, green, and amber traffic signals.
- Hearing sufficient to perceive a forced whisper at 5 feet or more in the better ear, with or without a hearing aid; alternatively, an audiometric test showing average hearing loss no greater than 40 decibels at 500, 1,000, and 2,000 Hz in the better ear.
- No current diagnosis of a heart condition known to cause sudden loss of consciousness or physical collapse, and no high blood pressure likely to interfere with safe driving.6eCFR. 49 CFR 391.41 – Physical Qualifications for Drivers
The examiner also screens for epilepsy, insulin-treated diabetes, and other conditions that could impair safe driving.
How Often the Exam Repeats
Section 391.45 requires reexamination at least every 24 months. Drivers qualified under the alternative vision standard in § 391.44, and insulin-treated diabetic drivers qualified under § 391.46, must be examined and certified every year.7eCFR. 49 CFR 391.45 – Persons Who Must Be Medically Examined and Certified
Alternative Paths for Vision and Limb Impairment
A driver who falls short of the 20/40 acuity or 70-degree field standard in the worse eye can still qualify under § 391.44 if the better eye meets both standards and the vision deficiency is stable. The process starts with an eye specialist completing a Vision Evaluation Report (Form MCSA-5871); the medical exam must follow within 45 days. A driver qualifying this way for the first time must also pass a road test, unless they have three years of prior CMV experience with the vision deficiency or previously held an FMCSA vision exemption.8eCFR. 49 CFR 391.44 – Alternative Physical Qualification Standards for Vision
Drivers with a missing or impaired limb who cannot meet the standard physical requirements can apply for a Skill Performance Evaluation (SPE) certificate under § 391.49. The applicant must show fine motor control and power grip with each hand independently, and must be fitted and proficient with any needed prosthetic before applying. An SPE certificate is valid for up to 2 years and may be renewed beginning 30 days before it expires.9eCFR. 49 CFR 391.49 – Alternative Physical Qualification Standards for Loss or Impairment of Limbs
What the Carrier Must Keep in the Driver Qualification File
Section 391.51 requires each motor carrier to maintain a qualification file for every driver it employs and to keep that file for the length of employment plus three years afterward.10eCFR. 49 CFR 391.51 – General Requirements for Driver Qualification Files The file has several required components.
Employment Application
Under § 391.21, the application must include a 3-year employment history with all employers, dates, and reasons for leaving. For an applicant who previously operated a CMV requiring a CDL, the look-back extends to 10 years total (the 3-year history plus names and addresses of CMV employers going back an additional 7 years). It must also list every traffic conviction (parking excluded) from the preceding 3 years, whether the violation happened in a commercial vehicle or a personal one, and disclose any license denial, suspension, or revocation.11eCFR. 49 CFR 391.21 – Application for Employment
Motor Vehicle Record and Annual Review
The carrier must pull a motor vehicle record from every state where the driver held a license during the preceding 3 years, then repeat the MVR check annually to confirm the driver remains in good standing.10eCFR. 49 CFR 391.51 – General Requirements for Driver Qualification Files
Road Test
Before the driver begins work, the carrier must give a road test using the same type of vehicle the driver will actually operate, administered by someone competent to evaluate commercial driving skills. A signed road test certificate identifying the vehicle type, approximate distance driven, and examiner details goes into the file.12eCFR. 49 CFR 391.31 – Road Test
Drug and Alcohol Clearinghouse Query
Before hiring any CDL driver, the carrier must run a full query of the FMCSA Drug and Alcohol Clearinghouse to check for unresolved violations, such as a positive drug test, an alcohol test at or above 0.04, or a test refusal. The driver must provide specific electronic consent for the full query. After hiring, the carrier must query the Clearinghouse at least once a year for every CDL driver on payroll. That annual check can be a limited query, but if it returns a hit the carrier has 24 hours to run a full query and must pull the driver from safety-sensitive duties in the meantime.13eCFR. 49 CFR 382.701 – Drug and Alcohol Clearinghouse
Offenses That Disqualify a Driver
Section 391.15 identifies the offenses that strip a driver of the right to operate a CMV:
- Driving a CMV with a blood alcohol concentration of 0.04 or higher, driving under the influence as defined by state law, or refusing a required alcohol test.
- Leaving the scene of an accident while operating a CMV.
- Committing a felony involving the use of a CMV.
- Transporting or possessing controlled substances.14eCFR. 49 CFR 391.15 – Disqualification of Drivers
A first conviction produces a 1-year disqualification. If the offense involved only the transportation or possession of controlled substances, the disqualification is 6 months. A second conviction within 3 years of a prior disqualifying offense extends the ban to 3 years.15eCFR. 49 CFR 391.15 – Disqualification of Drivers
Section 391.15 also disqualifies drivers for repeated texting while operating a CMV and for repeated use of a hand-held mobile phone while driving: 60 days for a second violation and 120 days for a third or more within 3 years, in each category.14eCFR. 49 CFR 391.15 – Disqualification of Drivers
A separate set of CDL disqualifications in 49 CFR Part 383 runs in parallel and covers serious traffic violations like excessive speeding and reckless driving, along with lifetime bans for repeat major offenses. Both sets apply at once, and whichever produces the longer disqualification controls.16eCFR. 49 CFR 383.51 – Disqualification of Drivers
Driver’s Duty to Report
If a driver receives notice that their license, permit, or privilege to operate a CMV has been revoked, suspended, or withdrawn, they must notify their employer by the end of the next business day.14eCFR. 49 CFR 391.15 – Disqualification of Drivers Waiting through a weekend already breaks the rule.
Exemptions From Part 391
A few operations sit outside the full Part 391 framework. Drivers of CMVs controlled and operated by beekeeping operations engaged in seasonal transportation of bees are exempt from the qualification requirements, with one carveout: the texting and hand-held mobile phone disqualification rules in § 391.15(e) and (f) still apply.17Federal Motor Carrier Safety Administration. Farm, Ranch, and Agricultural Transportation Exemption Reference Guide
The FMCSA has also granted a renewable exemption letting drivers under 21 who work for members of U.S. Custom Harvesters, Inc. drive in interstate commerce for custom harvesting operations. Those drivers must carry a copy of the exemption notice and be able to verify their custom harvesting status through documentation like scale sheets, company paperwork, or equipment on board.18Federal Register. Commercial Drivers License: US Custom Harvesters Inc Application for Renewal of Exemption
Penalties for Getting It Wrong
The FMCSA adjusts civil penalty amounts every year for inflation. Under the adjustment effective in 2025, a carrier’s non-recordkeeping violation can reach $19,246 per offense; a driver’s individual violation of the same type can reach $4,812. Violations tied to CDL requirements carry penalties up to $7,155. A carrier that knowingly allows a driver to operate in violation of an out-of-service order faces a maximum penalty of $39,615, and hazardous materials violations can exceed $102,000 per offense.19Federal Register. Revisions to Civil Penalty Amounts 2025 Those numbers climb annually, which is why a missing MVR or an expired medical card is not a paperwork nuisance so much as a standing financial exposure.