CDL Requirements for Truck Drivers: What the Law Says

Commercial truck drivers in the United States must hold a valid Commercial Driver's License (CDL) that matches the vehicle they operate, pass a medical certification exam, and follow federal hours-of-service limits set by the Federal Motor Carrier Safety Administration (FMCSA). These rules exist to keep unqualified or unfit drivers off the road. If a trucker violated one of these requirements before a crash, that violation can become important evidence in a truck accident claim.

Key takeaways

• A CDL is required to operate most large trucks, and federal law sets minimum standards that every state must meet or exceed.
• Drivers must pass a medical exam and carry a valid medical certificate, generally renewed every two years or sooner if a condition requires it.
• Federal hours-of-service rules limit how long a driver can be on duty and behind the wheel without rest.
• CDL and hours-of-service violations found after a crash can support a negligence claim against the driver and, in some cases, the trucking company.
• Specific licensing details vary by state, so always confirm current rules with your state's driver licensing agency.

What are the basic CDL requirements for truck drivers?

To get a CDL, a driver generally must be at least 18 years old to drive within their home state (intrastate) and 21 years old to cross state lines (interstate) or haul hazardous materials. Federal rules set the floor for these requirements, and every state issues its own CDLs following FMCSA standards under 49 CFR Part 383.

Beyond age, applicants must:

• Pass a knowledge test covering general trucking rules, air brakes, and the specific type of vehicle or cargo involved.
• Pass a skills test that includes a pre-trip vehicle inspection, basic vehicle control, and an on-road driving test.
• Hold a valid medical certificate showing they are physically qualified to drive.
• Pass a background check, including a review of prior driving record and, in many cases, a drug and alcohol testing history check through the FMCSA Drug and Alcohol Clearinghouse.

States handle the actual licensing process, so paperwork, fees, and some procedural details differ from state to state. The federal government sets the minimum safety standards that every state CDL program must follow.

What are the different classes of CDL?

A CDL class determines what size and type of vehicle a driver may legally operate. There are three main classes:

Drivers may also need specific "endorsements" added to their CDL for tasks like hauling hazardous materials (H), driving tankers (N), or pulling double/triple trailers (T). Each endorsement requires passing an additional written test, and the hazmat endorsement also requires a background check through the Transportation Security Administration.

What medical requirements must a truck driver meet?

Commercial drivers must pass a medical exam performed by a certified medical examiner listed on the FMCSA National Registry, and carry proof of that certification while driving. The exam checks vision, hearing, blood pressure, and other health factors that could affect safe driving. A driver who does not meet the physical qualification standards in 49 CFR Part 391 is not legally allowed to operate a commercial motor vehicle.

Medical certificates are generally valid for up to two years, though examiners can issue shorter certification periods for drivers with certain health conditions, such as high blood pressure or diabetes, that need closer monitoring. The CDL holder's driving record will also reflect their current medical certification status, and law enforcement or a carrier's safety department can check this during roadside inspections or hiring.

Federal law also sets a blood alcohol limit of 0.04% for CDL holders operating a commercial vehicle, which is stricter than the standard limit that applies to non-commercial drivers in most states.

What are the hours-of-service limits for truck drivers?

Federal hours-of-service (HOS) rules limit how many hours a truck driver can drive and work before taking required rest. These rules, found in 49 CFR Part 395, exist because driver fatigue is a well-documented cause of serious truck crashes.

For property-carrying drivers, the core limits are:

• 11 hours of driving allowed after 10 consecutive hours off duty.
• No driving after the 14th hour on duty following that 10-hour break.
• A 30-minute break required after 8 cumulative hours of driving.
• A 60-hour limit over 7 consecutive days, or 70 hours over 8 consecutive days, depending on the carrier's schedule.
• A 34-hour "restart" period that can reset the weekly hour count.
• Adverse driving conditions (like unexpected weather or traffic) can extend the 11-hour and 14-hour limits by up to 2 additional hours.

Passenger-carrying drivers follow slightly different limits: 10 hours of driving after 8 consecutive hours off duty, and no driving after 15 hours on duty.

Most carriers must track these hours using an Electronic Logging Device (ELD), which automatically records driving time and connects to the truck's engine. Carriers are generally required to keep these records of duty status for six months. If a driver was over their hours at the time of a crash, that data can be a critical piece of evidence. Learn more about how this data is used in Electronic Logging Device Truck Accident Data: What It Shows and Truck Black Box Data After an Accident. You can also check sample scenarios with the DOT hours of service calculator.

How do CDL requirements affect a truck accident claim?

CDL and safety rule violations can serve as strong evidence that a driver or trucking company was negligent, meaning they failed to act with reasonable care. If a driver was operating without a valid CDL, without the correct endorsement, without current medical certification, or in violation of hours-of-service limits, this can support a claim that the crash resulted from unsafe or illegal conduct rather than simple driver error.

Some practical examples:

• A driver hauling hazardous chemicals without a hazmat endorsement may face scrutiny over whether they were properly trained for that cargo.
• A driver whose medical certificate had expired months before the crash could raise questions about whether an undiagnosed or unmanaged health condition contributed to the accident.
• A driver who exceeded the 11-hour driving limit, based on ELD records, may support a fatigue-related negligence claim.

In some cases, evidence that a trucking company knowingly let an unqualified or over-hours driver operate a truck can also support a separate claim against the company itself for negligent hiring or supervision, and in rare and more serious cases, may be relevant to a request for punitive damages in a truck accident case. For a broader look at how trucking cases differ from ordinary car accident claims, see Truck Accident vs Car Accident Claim: Key Legal Differences.

How can I find out if a driver's CDL or records were compliant?

You generally cannot pull a commercial driver's full record yourself, but several sources can help confirm compliance after a crash. The police report from the scene often lists the driver's license number and class, which can be checked against state records. Learn how to obtain this document in Truck Accident Police Report: What It Is and How to Get It.

Other useful sources of information include:

• FMCSA's Safety and Fitness Electronic Records (SAFER) system, which shows basic information about a carrier's safety record.
• The truck's ELD data and black box (event data recorder) information, which may need to be requested formally before it is lost or overwritten.
• Employment records from the trucking company, which may show hiring checks, training, and any prior violations.

Because electronic logs and black box data are sometimes overwritten on a routine schedule, it helps to act quickly. A written preservation request sent soon after a crash can prevent this evidence from disappearing. For a full list of records worth securing, see the Truck Accident Evidence to Preserve: A Complete Checklist.

What should I do after a crash involving a commercial truck?

Start by documenting the scene and getting medical care, then look into whether the driver and carrier were following federal safety rules. A practical checklist:

1. Seek medical attention, even if injuries seem minor at first.
2. Request a copy of the official crash report once it's available.
3. Note the truck's company name, USDOT number, and license plate if possible.
4. Avoid giving a recorded statement to the trucking company's insurance adjuster before understanding your rights. See Dealing with Trucking Insurance Adjusters After a Crash.
5. Keep track of medical bills and ask about who is responsible for paying them in the meantime; see Who Pays Medical Bills After a Truck Accident?
6. Check your state's filing deadline using the statute of limitations calculator or the 50-state deadlines and fault rules table.

Filing deadlines, known as statutes of limitations, vary by state. Most states allow two or three years to file a personal injury claim, a few allow only one year, and some allow longer. Claims against a government agency, or wrongful death claims after a fatal crash, often have different and sometimes shorter deadlines. Never assume you have plenty of time. If the crash caused a death, review Truck Accident Wrongful Death Claim: What Families Need to Know for more on how those claims differ.

Who can be held responsible if a driver violated CDL rules?

Both the driver and the trucking company can potentially be held responsible, depending on what the evidence shows. A driver who lacked proper licensing or ignored hours-of-service rules may be personally negligent. A trucking company that hired an unqualified driver, failed to verify medical certification, or pressured a driver to exceed legal hours may share responsibility as well.

Interstate for-hire carriers are also required to carry minimum liability insurance under federal law: generally $750,000 for general freight, $1,000,000 for carriers of oil and certain other materials, and $5,000,000 for carriers of certain hazardous materials. This insurance is meant to make sure injured people can recover compensation for serious crashes. Learn more in Truck Accident Insurance Minimums: What Coverage Applies. For details on building a case against a carrier, see Suing a Trucking Company: What You Need to Know and How Do Truck Accident Lawsuits Work? A Step-by-Step Guide.

If you're trying to understand what a crash might be worth, it helps to look at the factors involved rather than guess at a number. The truck accident settlement calculator and pain and suffering calculator are educational tools that walk through those factors based on your specific situation.

Sources

• FMCSA – Hours of Service Regulations
• eCFR – 49 CFR Part 391, Qualifications of Drivers
• Federal Motor Carrier Safety Administration