What You Can Drive With a Class B License

A Class B license lets you drive single vehicles up to a certain weight, but not combinations

A Class B license permits you to operate a single motor vehicle — one without a trailer — up to a gross vehicle weight rating (GVWR) of 26,001 pounds or more in most states. The exact weight threshold and what vehicles fall under Class B varies by state, so you need to check your state's Department of Motor Vehicles rules before assuming a vehicle is legal for you to drive.

The core distinction is that Class B does not allow you to tow a trailer or operate a combination vehicle. If you want to pull a trailer, even a small one, you typically need a Class A license instead. This matters because many people assume they can tow with a Class B and discover otherwise during a traffic stop or insurance claim.

Class B is common for people who drive delivery trucks, dump trucks, box trucks, and other commercial single-unit vehicles. It is also the license class for some school bus drivers, though school bus endorsements have their own separate requirements beyond the base license class.

Key Takeaways

Class B covers single vehicles only — no trailers or combinations — and the weight limit varies by state but is often 26,001 pounds GVWR or higher.
You cannot legally tow any trailer with a Class B license in most states; towing requires a Class A or a specific endorsement.
Commercial Class B drivers must pass a written knowledge test, a skills test, and a medical examination (DOT physical) in most states.
School bus drivers need a Class B or higher plus a School Bus (S) endorsement, which requires additional testing and background checks.
Upgrading from Class B to Class A requires passing the Class A knowledge and skills tests; you do not lose your Class B when you upgrade.

Weight limits and what vehicles fall under Class B

Most states define Class B as any single motor vehicle with a GVWR of 26,001 pounds or more, but some states set the threshold at 10,001 pounds. A few states use different numbers entirely. The GVWR is the maximum weight the vehicle is designed to carry when fully loaded — not what it weighs empty. You can find the GVWR on a label inside the driver's door jamb or in the owner's manual.

Vehicles that typically require a Class B license include straight trucks (box trucks, dump trucks, delivery trucks), some RVs, and certain commercial vehicles. A pickup truck with a GVWR under the state threshold usually falls under Class D (regular passenger vehicle) even if you use it for work. The distinction matters because driving a vehicle that requires Class B with only a Class D license is a violation in every state.

The weight limit exists because heavier vehicles require different braking, handling, and stopping distance. A Class B driver has demonstrated they understand these differences through testing. Driving a vehicle outside your license class can result in fines, points on your record, and denial of insurance coverage if you are in an accident.

Commercial Class B requirements and the CDL process

If you drive a Class B vehicle for work, you need a Commercial Driver License (CDL) Class B in most states. A few states allow non-commercial Class B licenses for certain vehicles, but the commercial version is far more common and is what employers require.

To obtain a CDL Class B, you must pass three tests: a written knowledge test specific to Class B vehicles, a pre-trip inspection skills test, and a road skills test. You also need to pass a DOT physical examination, which checks your vision, hearing, blood pressure, and other health markers. The physical is valid for two years and must be current before you can drive commercially.

Most states require you to hold a valid Class D (regular) license for at least 14 days before you can test for a CDL. Some states waive this waiting period if you already hold a CDL in another class. The knowledge test covers air brakes, vehicle systems, safe driving practices, and cargo handling if applicable. The skills tests are performed by a third-party examiner at a testing facility, not at the DMV office.

School bus drivers and the School Bus endorsement

School bus drivers need a Class B or higher license plus a School Bus (S) endorsement. The endorsement is separate from the base license class and requires its own written test, skills test, and background check. Most states also require school bus drivers to pass a medical examination, though the standards may differ slightly from the standard DOT physical.

The School Bus endorsement test covers passenger safety, emergency procedures, loading and unloading, and state-specific school bus regulations. Many states require you to pass the test at the DMV office rather than with a third-party examiner. Background checks typically include a criminal history review and a check of your driving record; any serious violations or convictions can disqualify you.

School bus drivers must also complete training specific to their state and often their school district. This training covers evacuation procedures, first aid, and student management. The endorsement must be renewed periodically — usually every three to five years — and renewal often requires passing the written test again.

Restrictions and endorsements that may explore to your Class B

Your Class B license may carry restrictions that limit what you can drive or when you can drive it. Common restrictions include air brake restrictions (if you failed the air brake portion of the test), automatic transmission only, or daylight driving only. A restriction appears on your license and is legally binding; driving outside a restriction is a violation.

You may also have endorsements on your Class B, which are permissions to do something you could not otherwise do. The most common endorsements are Hazmat (hazardous materials), Tanker, and Doubles/Triples (for pulling multiple trailers). Each endorsement requires a separate written test and, in the case of Hazmat, a background check and fingerprinting. Endorsements are not automatic; you must request them and pass the required tests.

If you want to remove a restriction or add an endorsement, you must contact your state's DMV and request testing for that specific restriction or endorsement. You cannot straightforward pay a fee and have it removed or added without passing the test.

Upgrading from Class B to Class A

If you want to tow a trailer or operate a combination vehicle, you need to upgrade to a Class A license. The upgrade process requires passing the Class A knowledge test and the Class A skills test. You do not lose your Class B when you upgrade; your license will show Class A, which is a higher class that includes the privileges of Class B.

The Class A knowledge test covers combination vehicles, coupling and uncoupling, and safe towing practices. The skills test includes a pre-trip inspection of a combination vehicle and a road test with a trailer. Most states allow you to use the same vehicle you tested with for Class B if it meets Class A requirements, but you must have access to a combination vehicle to test.

Some states allow you to upgrade without retesting if you already hold a Class B CDL and meet certain conditions, but this varies widely. Contact your state's DMV to learn whether you can upgrade without a full retest or whether you must pass both tests again.

Frequently Asked Questions

Can I tow a small trailer with a Class B license?

No. Class B does not permit towing any trailer in most states, regardless of the trailer's size or weight. Some states have exceptions for very small utility trailers under specific weight limits, but these are rare. Check your state's rules before towing anything; the penalty for towing without the proper license class can include fines and points on your record.

What is the difference between a commercial Class B and a non-commercial Class B?

A commercial Class B (CDL) is required if you drive a Class B vehicle for work or for compensation. A non-commercial Class B is available in some states for personal use only. Most employers require a CDL regardless of whether the job is technically "commercial," so a CDL is the safer choice if you plan to drive professionally.

Do I need a medical exam to renew my Class B license?

If you hold a commercial Class B (CDL), yes — you need a current DOT physical, which is valid for two years. If you hold a non-commercial Class B, most states do not require a medical exam for renewal, though some do. Check your state's renewal requirements when your license is due to expire.

What happens if I drive a Class B vehicle with only a Class D license?

You are driving without the proper license class, which is a violation in every state. You can be fined, receive points on your record, and your insurance may deny coverage if you are in an accident. Your employer can also face penalties if they knowingly allowed you to drive without the proper license.

Can I test for Class B if I do not have a Class D license yet?

Most states require you to hold a valid Class D license for at least 14 days before testing for a CDL Class B. Some states waive this if you already hold a CDL in another class. Contact your state's DMV to confirm the waiting period and whether any waivers explore to you.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.