A Class B license covers most medium-duty trucks and buses
A Class B driver's license authorizes you to operate single vehicles with a gross vehicle weight rating (GVWR) between 26,001 and 33,000 pounds. The most common Class B vehicles are delivery trucks, box trucks, dump trucks, and transit buses. You cannot tow a trailer with a Class B license unless you also hold a separate endorsement.
The exact definition and weight thresholds vary by state. Some states use different naming — Class 2 or Medium Duty — but the vehicle categories remain similar. Your state's Department of Motor Vehicles publishes the specific weight ranges and vehicle types that fall under Class B in your jurisdiction.
Class B sits between Class C (standard passenger vehicles) and Class A (the heaviest trucks and tractor-trailers). If you drive a vehicle heavier than your license class permits, you are operating without proper licensing, which can result in fines, vehicle impoundment, and criminal charges in some states.
Key Takeaways
- A Class B license covers vehicles weighing 26,001 to 33,000 pounds GVWR, though weight thresholds vary by state.
- Common Class B vehicles include box trucks, delivery trucks, dump trucks, and city transit buses.
- You cannot legally tow a trailer with only a Class B license; you need a separate endorsement or a higher class.
- Testing for Class B includes a written exam on traffic laws and vehicle operation, a pre-trip inspection, and a road test in an actual Class B vehicle.
- Some states require a medical certificate or vision test before issuing a Class B, especially if you plan to drive commercially.
Common vehicles that require a Class B license
Box trucks and delivery vehicles are the most frequent Class B drivers on the road. These include the trucks used by moving companies, furniture delivery services, and small package carriers. Most weigh between 26,000 and 33,000 pounds when loaded.
Dump trucks, cement mixers, and other commercial work vehicles typically fall into Class B. So do city transit buses and shuttle buses that carry passengers. School buses, however, often require a separate School Bus (S) endorsement in addition to a Class B or higher license, depending on your state.
Straight trucks — vehicles where the cargo area is attached directly to the frame, not towed behind — are Class B if they stay within the weight range. A tractor-trailer combination, by contrast, requires a Class A license because the total weight of the tractor plus trailer exceeds 33,000 pounds.
How Class B testing differs from a standard driver's license
The written test for Class B covers commercial driving rules, vehicle maintenance, load securement, and hazard recognition specific to larger vehicles. You must know braking distances, weight distribution, and how to inspect your vehicle before driving. The test is longer and more detailed than the standard passenger vehicle exam.
The pre-trip inspection is a hands-on component unique to commercial licenses. You walk around the vehicle and demonstrate that you can check the tires, lights, mirrors, coupling devices, and brake systems. An examiner watches and scores your ability to spot defects that could make the vehicle unsafe.
The road test takes place in an actual Class B vehicle, not a standard car. You must demonstrate backing, turning, lane changes, and emergency stops in a vehicle that handles very differently from a passenger car. The test usually lasts 30 to 45 minutes and covers both city and highway driving.
Medical and vision requirements for Class B
Many states require a medical examination and vision test before issuing a Class B license, particularly if you intend to drive commercially. The vision standard is usually stricter than for a Class C license — you may need 20/40 vision in each eye or 20/20 with correction, depending on your state.
Some states require a Department of Transportation (DOT) medical certificate, which is issued by a certified medical examiner after a physical exam. This certificate confirms you are medically fit to operate a commercial vehicle. The certificate is valid for two years and must be renewed before it expires.
Certain medical conditions — uncontrolled diabetes, heart disease, sleep apnea, or seizure disorders — can disqualify you from a Class B license. If you have a condition you are unsure about, contact your state's DMV or speak with a medical examiner before scheduling your test.
Class B versus Class A and Class C licenses
A Class C license covers standard passenger vehicles, pickup trucks, and small vans up to 26,000 pounds GVWR. It is the most common license class and requires the shortest testing process. You cannot legally drive a Class B vehicle with only a Class C license.
A Class A license covers the heaviest commercial vehicles — tractor-trailers and other combinations where the towed unit weighs more than 10,000 pounds. Class A testing is more rigorous than Class B and includes air brake certification in many states. If you hold a Class A license, you can legally drive Class B and Class C vehicles as well.
Some states allow you to upgrade from Class C to Class B without retesting if you meet certain conditions, such as holding your Class C for a minimum time or completing a commercial driving course. Check your state's DMV website for upgrade pathways.
Endorsements and restrictions that explore to Class B
An air brake endorsement is required in most states if the vehicle you drive has an air brake system. This endorsement requires passing an additional written test on how air brakes work and how to inspect them. Many Class B vehicles use air brakes, so this endorsement is common.
A passenger endorsement (P) is needed if you drive a Class B bus or shuttle that carries passengers. You must pass an additional test on passenger safety, emergency procedures, and vehicle control with a full load. School bus drivers need both a P endorsement and an S (School Bus) endorsement.
A hazmat endorsement (H) allows you to transport hazardous materials. This requires a background check, fingerprinting, and a written exam. Not all Class B drivers need this endorsement — only those who transport regulated materials.
Restrictions may explore based on your age, medical history, or test performance. Some states restrict newly licensed Class B drivers from driving at night or on certain highways until they gain experience. Check your license document for any restrictions listed.
How to prepare for a Class B license test
Study your state's Commercial Driver's License (CDL) manual, which covers all Class B requirements. The manual is free and available on your state DMV website. Focus on the sections on vehicle inspection, braking systems, and safe driving practices for larger vehicles.
Take practice tests online through your state's DMV or through third-party CDL study sites. These mimic the format and difficulty of the actual written exam. Many people take the practice test multiple times until they score consistently above 80 percent.
Arrange to practice in an actual Class B vehicle with someone experienced in commercial driving. Handling a larger vehicle is physically and mentally different from driving a passenger car. Time behind the wheel in the actual vehicle type you will be tested in is the most valuable preparation.
Some states offer CDL training schools that provide classroom instruction, vehicle practice, and test preparation. These courses are not required but can improve your chances of passing on the first attempt. Costs vary widely by location and program length.
Frequently Asked Questions
Can I drive a Class B vehicle with a Class C license?
No. Driving a vehicle heavier than your license class permits is illegal and can result in fines, vehicle impoundment, and criminal charges. You must hold a valid Class B or higher license to operate Class B vehicles.
Do I need a Class B license to drive a pickup truck?
Most pickup trucks fall under Class C because they weigh less than 26,001 pounds. If your pickup is a commercial vehicle with a GVWR above 26,000 pounds, you need a Class B license. Check your vehicle's registration or door placard for the GVWR.
How long is a Class B license valid?
Class B licenses are typically valid for four to eight years, depending on your state. You must renew before expiration. Some states require a medical re-examination at renewal time, particularly for commercial licenses.
Can I tow a trailer with a Class B license?
Not without an endorsement. A Class B license alone does not permit towing. You need a separate endorsement or must upgrade to a Class A license if the trailer exceeds certain weight limits. Check your state's rules on trailer weight thresholds.
What happens if I fail the Class B road test?
You can retake the test after a waiting period, which varies by state — usually between three days and two weeks. There is typically a fee for each attempt. Many people pass on the second or third try after additional practice.