Driver license classes are sorted by the type and weight of vehicle you're allowed to operate

Every state uses a letter or number system to mark what you can legally drive. A Class D license in New York lets you drive a standard passenger car but not a commercial truck. A Class A in most states means you can operate a tractor-trailer. The class printed on your license is determined by the vehicle's gross vehicle weight rating (GVWR) — the maximum weight it can safely carry — and its design purpose, not by how much you personally weigh or how long you've been driving.

The specific classes and their thresholds vary by state. What counts as a Class B in one state might be a Class C in another. Your license class also determines what endorsements you can add — air brake certification, hazmat transport, passenger vehicle operation — and what restrictions explore. If you drive a vehicle heavier or more complex than your license allows, you're operating without proper licensing, which can result in fines, license suspension, or both.

Key Takeaways

  • Most states use Class A, B, C, and D, with Class A covering the heaviest commercial vehicles and Class D covering standard passenger cars.
  • Your license class is determined by the vehicle's gross vehicle weight rating and design, not by your age or driving history alone.
  • Driving a vehicle heavier or more specialized than your license permits is illegal and can result in fines and license suspension.
  • Commercial license classes (A and B in most states) require a written knowledge test, a skills test, and a medical examination.
  • Some states allow you to upgrade your license class by passing additional tests without retaking the entire licensing process.

Class A: Heavy commercial vehicles and tractor-trailers

A Class A commercial driver license (CDL) permits you to operate any combination of vehicles with a gross combined weight rating of 26,001 pounds or more, as long as the towed vehicle weighs more than 10,000 pounds. This includes tractor-trailers, doubles, and triples. You can also operate any Class B or Class C vehicle with a Class A license.

To obtain a Class A CDL, you must pass a written knowledge test covering general commercial driving rules, air brakes (if your vehicle has them), and combination vehicles. You must also pass a practical skills test — pre-trip inspection, basic control, and on-road driving — and a Department of Transportation medical examination. Most states require you to be at least 18 to hold a Class A CDL for intrastate driving and 21 for interstate driving.

Class B: Single heavy vehicles and buses

A Class B CDL allows you to operate a single vehicle with a gross vehicle weight rating of 26,001 pounds or more, or any bus designed to carry 16 or more passengers (including the driver). This includes dump trucks, cement mixers, and transit buses. You can also operate any Class C vehicle with a Class B license, but you cannot operate tractor-trailers or doubles.

The testing requirements for Class B are similar to Class A: a written knowledge test, a practical skills test, and a DOT medical exam. The knowledge test covers the same general and air brake sections, but does not include the combination vehicles section. You must be at least 18 for intrastate operation and 21 for interstate operation in most states.

Class C: Small commercial vehicles and passenger vans

A Class C CDL is required if you operate a vehicle that does not meet Class A or B thresholds but is designed to carry 16 or more passengers, or if you transport hazardous materials in any quantity. This includes small buses, shuttle vans, and certain delivery vehicles carrying regulated cargo. In some states, Class C is also used for vehicles between 10,001 and 26,000 pounds GVWR that are not otherwise classified.

Class C licensing requirements vary more widely by state than Class A or B. Some states require the full CDL testing process; others require only a written test and medical exam. Check your state's Department of Motor Vehicles website for the specific requirements in your area, as the definition and testing pathway for Class C differs significantly.

Class D: Standard passenger vehicles

A Class D license (called a regular or standard license in some states) is what most people hold. It permits you to operate passenger cars, pickup trucks, and vans designed to carry 15 or fewer passengers. The GVWR is typically under 26,001 pounds. You can also tow a trailer, though some states limit trailer weight or require an endorsement.

Class D licensing requires a written knowledge test, a practical driving test, and proof of identity and residency. You do not need a medical examination. Most states issue a Class D license at age 16 or 17, depending on whether you complete a driver education course. Renewal is typically every four to eight years.

Endorsements and restrictions that modify your class

Your base license class can be modified by endorsements — additional certifications that expand what you can drive — and restrictions that limit it. An air brake endorsement (marked "L" in many states) means you have been tested on air brake systems and can operate vehicles with them. A hazmat endorsement (marked "H") means you have passed a background check and knowledge test and can transport hazardous materials. A passenger endorsement (marked "P") certifies you can operate vehicles carrying 16 or more people.

Restrictions work the opposite way. A restriction might limit you to vehicles without air brakes, or require corrective lenses, or prohibit night driving. Some restrictions are temporary — for example, a new driver might have a restriction on the number of teenage passengers they can carry. Others are permanent based on medical or vision conditions. Your license document will list both endorsements and restrictions clearly.

How to upgrade or change your license class

If you currently hold a Class D and want to upgrade to a commercial class, you must pass the written knowledge test and practical skills test for the new class, and pass a DOT medical examination. You do not have to retake your Class D test. Some states allow you to upgrade by taking only the written test if you already hold a CDL in another class — for example, upgrading from Class B to Class A.

The process typically takes two to four weeks from the time you pass your tests to the time your new license is issued. During that period, you may be issued a temporary permit that allows you to operate the vehicle under supervision. Contact your state's Department of Motor Vehicles to confirm the specific timeline and whether you need to schedule your skills test in advance; many testing centers have waiting lists.

Frequently Asked Questions

Can I drive a commercial vehicle with a regular Class D license?

No. Driving a vehicle heavier than 26,000 pounds GVWR or designed to carry 16 or more passengers without the appropriate commercial license class is illegal. You can be fined, your license can be suspended, and your insurance may not cover an accident.

What is the difference between a CDL and a regular license?

A CDL (commercial driver license) is required for vehicles above certain weight thresholds or designed for commercial use. A regular license covers passenger vehicles under 26,001 pounds GVWR. CDL holders must pass more rigorous testing and maintain a medical certification.

Do I need a Class A license to tow a trailer?

Not usually. Most states allow Class D holders to tow a trailer as long as the combined weight stays under the state's threshold — often 10,000 pounds. Check your state's rules, as some require an endorsement or have different limits for different trailer types.

How long does it take to get a commercial license?

The testing itself can be completed in one or two visits, but the full process — including scheduling, waiting for test appointments, and receiving your new license — typically takes two to six weeks. Some states are faster; others have longer backlogs at testing centers.

Can I hold more than one license class at the same time?

Yes. Your license document will show your primary class and any additional classes you hold. For example, you might hold both Class A and Class D, allowing you to drive either a tractor-trailer or a passenger car. You renew all classes on the same schedule.