A Class B license is for driving single large vehicles — mostly buses and some trucks — but not combinations of vehicles towed together

A Class B license authorizes you to operate a single vehicle over a certain weight threshold, typically 26,001 pounds or more. The exact weight cutoff and what vehicles fall under Class B vary by state. In most states, Class B covers buses (including school buses and transit buses), large straight trucks, and some dump trucks or cement mixers — but not tractor-trailers or any vehicle towing a trailer.

The key distinction is that Class B applies to one vehicle only. If you want to tow anything — a trailer, a boat, a car — you need a different class of license, usually Class A. This matters because the rules, testing, and restrictions differ significantly between states, and some states use different naming altogether.

Key Takeaways

  • Class B licenses cover single large vehicles weighing over 26,001 pounds in most states, but the exact threshold and vehicle types vary by state.
  • You cannot tow a trailer or any other vehicle with a Class B license in most states; towing requires a Class A license.
  • Getting a Class B license requires passing a written knowledge test, a skills test, and a medical examination in most states.
  • Some states call their license classes by different names or use different weight thresholds, so you need to check your specific state's rules.

How Class B differs from other commercial license classes

The main difference between Class B and Class A is towing. A Class A license covers any combination of vehicles where the towed unit weighs more than 10,000 pounds. A Class B license covers only single vehicles — no trailers, no towed units. If you drive a tractor-trailer, you need Class A. If you drive a bus or a large straight truck with no trailer, you need Class B.

Class C is typically a standard passenger vehicle license for cars, SUVs, and light trucks under 26,001 pounds. Some states also have a Class D license for smaller commercial vehicles or specific purposes. The exact breakdown depends on your state's Department of Motor Vehicles (DMV) or equivalent agency.

A few states use different systems entirely. For example, some states call their licenses "Type 1," "Type 2," and so on, or use letter combinations like "B+E" to show what you can tow. Before you pursue any commercial license, check your state's DMV website to see what class or type you actually need.

What vehicles you can legally drive with a Class B license

With a Class B license, you can drive buses — school buses, city transit buses, intercity coaches, and shuttle buses. You can also drive large straight trucks, including dump trucks, cement mixers, garbage trucks, and box trucks over the weight threshold. Some states allow Class B holders to drive certain RVs or motorhomes over a certain weight, though this varies.

You cannot drive a tractor-trailer, semi-truck, or any vehicle towing a trailer weighing more than 10,000 pounds. You also cannot drive a vehicle towing multiple trailers. If your job involves any towing, you need to verify whether your vehicle setup qualifies as Class A or Class B in your state — the weight of what you are towing matters as much as the weight of the vehicle itself.

Some states have additional restrictions on Class B licenses. For example, certain states limit where you can drive (no interstate highways, or only during certain hours) or require additional endorsements for specific cargo like hazardous materials. Check your state's rules before accepting a job that requires a Class B license.

Requirements to get a Class B license

To obtain a Class B license, you must first hold a valid regular driver's license (usually Class C or equivalent) in your state. You must be at least 18 years old in most states, though some states require 21 for certain vehicle types. You will need to pass a medical examination conducted by a certified medical examiner — this is a federal requirement for commercial drivers and covers vision, hearing, blood pressure, and other health factors.

Next, you take a written knowledge test covering vehicle operation, safety, and traffic laws specific to large vehicles. The test is usually 50 questions, and you must pass with a score of 80 percent or higher. You can study using your state's DMV manual or commercial driver's license (CDL) study guides, which are free online.

Finally, you take a skills test (also called a road test or driving test) in the actual vehicle you will be driving. The examiner watches you perform a pre-trip inspection, basic vehicle control exercises, and on-road driving. You must demonstrate safe operation and follow all traffic laws. The entire process typically takes several weeks to a few months, depending on how quickly you can schedule tests.

Medical examination and health requirements

The medical examination for a Class B license is not optional — it is a federal requirement under the Federal Motor Carrier Safety Administration (FMCSA) rules. You must see a certified medical examiner listed on the FMCSA National Registry. The exam covers your vision (you must have at least 20/40 in each eye, corrected or uncorrected), hearing, blood pressure, and a review of any medical conditions or medications that might affect your ability to drive safely.

Certain conditions can disqualify you or require special review. These include uncontrolled diabetes, heart disease, seizure disorders, sleep apnea, and some psychiatric medications. If you have any chronic health condition, bring your medical records to the exam. The examiner will let you know if you need additional documentation from your doctor.

The medical certificate is valid for two years (or one year if you are over 49 years old in some states). You must renew it before it expires if you want to keep driving commercially. Some employers require you to pass the exam before you start work; others allow you to start the process after you are hired.

State-by-state differences in Class B rules

While most states follow a similar Class A, B, C structure, the details vary. Some states set the Class B threshold at 26,001 pounds; others use 10,001 pounds or 15,000 pounds. Some states allow Class B holders to tow small trailers under a certain weight; others do not allow any towing. A few states have additional classes or endorsements you might need.

For example, California calls its commercial licenses "Class 2" and "Class 3" instead of A and B. Texas uses a similar system. Some states require an additional endorsement (marked on your license with a letter code) if you want to drive a school bus, haul hazardous materials, or carry passengers. These endorsements require extra testing and background checks.

Before you study for a test or accept a job, visit your state's DMV website and search for "commercial driver's license" or "Class B license." read the official manual and check the specific weight thresholds, vehicle types, and any endorsements your job might require. Rules change, and what applied last year may not explore now.

How to prepare for the Class B knowledge and skills tests

Start by obtaining your state's official CDL manual from the DMV website — it is free and covers everything on the knowledge test. Read it thoroughly, paying special attention to sections on large vehicle operation, braking systems, cargo securement, and safety procedures. Many states also offer free online practice tests that mimic the real exam format.

For the skills test, practice in the actual vehicle you will be tested in if possible. Spend time on pre-trip inspections, learning where every control is and how it works. Practice smooth acceleration, braking, and turning — large vehicles handle very differently from cars. If your employer provides training, take it seriously. If you are preparing on your own, consider hiring a professional CDL instructor for a few lessons; the cost is usually between $100 and $300 per lesson, but it significantly improves your chances of passing on the first attempt.

On test day, arrive early, bring all required documents (your regular license, medical certificate, proof of residency, and any other documents your state requires), and get a good night's sleep. The skills test is stressful, but examiners expect nerves. Focus on safety and following instructions, and you will likely pass.

Frequently Asked Questions

Can I drive a school bus with a Class B license?

Yes, but most states require an additional school bus endorsement on top of your Class B license. This endorsement requires a separate written test and background check. Some states also require fingerprinting and a medical clearance specific to school bus drivers. Check your state's DMV for the exact requirements.

Do I need a Class B license to drive a large RV?

It depends on the RV's weight and your state's rules. Most states do not require a commercial license for an RV you own and drive for personal use, even if it weighs over 26,001 pounds. However, if you drive an RV for a company or for hire, you likely need a Class B license. Check your state's DMV website for the specific threshold.

What happens if I drive a vehicle that requires a Class B license without one?

You can face fines ranging from $100 to $1,000 or more, depending on your state. You may also face criminal charges if you cause an accident. Your insurance may not cover damage or injuries if you were driving without the proper license. It is not worth the risk.

How long does it take to get a Class B license?

The timeline varies, but most people complete the process in four to eight weeks. This includes scheduling and passing the medical exam (one to two weeks), studying and passing the knowledge test (one to two weeks), and scheduling and passing the skills test (one to four weeks, depending on examiner availability). Some states have longer wait times for test appointments.

Can I get a Class B license if I have had traffic violations or accidents?

Traffic violations and accidents do not automatically disqualify you, but they may affect your ability to get hired by an employer. Some employers have strict hiring policies. The DMV will review your driving record, and serious violations (DUI, reckless driving, multiple speeding tickets) may result in denial. Contact your state's DMV to learn about your specific record is a barrier.