What a Class B license covers
A Class B driver license lets you drive single vehicles — not combinations — that weigh more than a Class C vehicle but less than a Class A. The exact weight threshold varies by state, but most define it as vehicles between 10,001 and 26,000 pounds gross vehicle weight rating (GVWR). This includes city buses, box trucks, dump trucks, and some delivery vehicles.
The key difference from a Class A license is that Class B does not permit you to tow a trailer. A Class A license, by contrast, covers tractor-trailers and other combination vehicles. If your job involves driving a single large vehicle — like a city transit bus or a straight truck — Class B is what you need.
Some states call this license class by different names. New York calls it a Class B, but Pennsylvania calls it a Class A, and other states use different numbering entirely. When you look up your state's requirements, search for the specific vehicle type you plan to drive rather than relying on the class letter alone.
Key Takeaways
- A Class B license covers single vehicles over 10,001 pounds GVWR but does not permit towing a trailer.
- You will need to pass a written knowledge test, a skills test, and a medical examination before you can obtain one.
- Most states require you to hold a regular driver license for a set period — often one to three years — before you can test for Class B.
- The skills test involves backing, turning, and stopping a large vehicle under the supervision of an examiner.
- Some employers will sponsor your training and testing if the job requires a Class B license.
Medical certification and physical requirements
Before you test for a Class B license, you must pass a Department of Transportation (DOT) medical examination. This is a physical exam performed by a certified medical examiner — not your regular doctor — and it checks your vision, hearing, blood pressure, and ability to operate a large vehicle safely. The exam costs between $50 and $150 depending on your state and the examiner.
The medical examiner will ask about your health history, including any conditions that might affect your ability to drive. If you have diabetes, heart disease, sleep apnea, or certain medications, you may still pass, but the examiner needs to know. Some conditions do disqualify you, and the examiner will tell you which ones explore in your case.
Once you pass the medical exam, you receive a medical certificate that is valid for two years (or one year if you are over 65 in most states). You must carry this certificate with you when you test for your Class B license, and you must renew it before it expires if you want to keep driving a Class B vehicle.
Written knowledge test and what it covers
The written test for a Class B license covers the rules of the road, vehicle inspection, and safe driving practices specific to large vehicles. Most states provide a study manual — often free online — that lists the exact topics. You will answer between 30 and 50 multiple-choice questions, and you typically need to score 80 percent or higher to pass.
The test includes questions about pre-trip inspections (checking brakes, tires, lights, and mirrors before you drive), how to handle a vehicle that weighs much more than a car, and what to do if your brakes fail. You will also answer questions about hours-of-service rules if your state enforces them for Class B drivers, though this is less common than for Class A.
You can take the written test at your state's Department of Motor Vehicles (DMV) or at an approved testing center. Most states let you take it on a computer, and you get your score when ready. If you fail, you can usually retake it after a waiting period — often 24 hours to one week depending on your state.
The skills test: what the examiner watches for
The skills test is a behind-the-wheel examination where an examiner watches you drive a Class B vehicle through a set of maneuvers. The test usually lasts 30 to 45 minutes and takes place in a controlled area — often a large parking lot or a closed course — before moving to public roads. You must bring a vehicle that meets the weight and type requirements for Class B in your state.
The examiner will ask you to perform a pre-trip inspection first, pointing out specific parts of the vehicle and explaining what you are checking. Then you will drive through a series of tasks: backing in a straight line, backing into a space, turning in a tight area, stopping smoothly, and accelerating safely. The examiner is watching for smooth steering, proper mirror use, awareness of the vehicle's size, and safe speed control.
If you fail the skills test, you can usually retake it after a waiting period. Many people fail on their first attempt because they misjudge the vehicle's size or do not use mirrors correctly. Practicing with the actual vehicle type you will drive — or one very similar — before you test makes a real difference.
How to prepare: training programs and practice
Some people prepare for a Class B license through a formal truck driving school, while others practice with an employer or a private instructor. A truck driving school typically costs $3,000 to $7,000 and takes four to eight weeks. The school covers classroom instruction, vehicle inspection, and behind-the-wheel training, and many schools will let you test at their facility.
If your employer is sponsoring you, they may cover the cost of training or let you practice with one of their vehicles under supervision. This is common for bus companies, delivery services, and construction firms. Ask your employer whether they have a preferred training program or whether they will let you practice on your own time.
If you are practicing on your own, find a large empty parking lot and practice backing, turning, and stopping until these movements feel natural. Bring someone who knows large vehicles — ideally someone who has already passed a Class B test — to watch and give feedback. The more hours you spend behind the wheel before the test, the more confident you will be.
State-by-state differences in Class B requirements
Every state has its own weight thresholds, testing procedures, and renewal rules for Class B licenses. Some states require a Class B license for any vehicle over 10,001 pounds; others set the threshold at 14,001 or 16,001 pounds. A few states do not use a Class B category at all and instead lump large single vehicles into a different class.
The written test, skills test, and medical requirements are also slightly different in each state. Some states require a separate air brake endorsement if the vehicle has air brakes; others do not. Some states let you test at the DMV; others require you to test at a certified third-party testing center.
Before you start preparing, visit your state's DMV website and read the Class B study manual and the list of testing locations. Call the DMV directly if the website does not clearly explain the weight threshold or the testing procedure — staff can answer questions faster than you can find the answer online.
Renewing and maintaining your Class B license
A Class B license is usually valid for four to eight years, depending on your state and your age. When it is time to renew, you will need to renew your medical certificate first — this is the step many people forget. If your medical certificate has expired, you cannot legally drive a Class B vehicle, even if your license itself has not expired.
Most states let you renew your Class B license by mail or online if you have no violations and your medical certificate is current. If you have had violations or your medical status has changed, you may need to visit the DMV in person or retake the written test. Check your state's renewal rules before your license expires so you do not accidentally drive illegally.
Frequently Asked Questions
Can I drive a Class B vehicle with a regular driver license?
No. Driving a vehicle that requires a Class B license without one is illegal and can result in fines, license suspension, and criminal charges. Your insurance will also not cover you if you are in an accident while driving without the proper license class.
Do I need a Class B license to drive a school bus?
Most states require a Class B license to drive a school bus, though a few allow it with a Class C license plus a school bus endorsement. Check with your state's Department of Education or the school district hiring you — they will tell you exactly what license you need.
What happens if my medical certificate expires while I have a Class B license?
You cannot legally drive a Class B vehicle once your medical certificate expires, even though your license itself may still be valid. You must renew your medical certificate before you drive again. If you are caught driving without a current medical certificate, you can be fined and cited.
How long does it take to get a Class B license from start to finish?
The timeline depends on how much you practice and how quickly you pass the tests. If you attend a formal training school, expect four to eight weeks. If you practice on your own, it could take anywhere from a few weeks to several months. The written test and medical exam can usually be completed within a week or two.
Can I take the skills test in my own vehicle?
Yes, as long as your vehicle meets your state's weight and type requirements for Class B. The vehicle must be in safe working condition, have working mirrors and brakes, and be insured. Some testing centers have their own vehicles you can use for a fee if you do not have access to one.