Class B is for single vehicles over 26,000 pounds that are not passenger cars
A Class B license authorizes you to drive a single large vehicle — typically a bus, truck, or motor home — that weighs more than 26,000 pounds gross vehicle weight rating (GVWR). The key word is "single": you cannot tow a trailer or haul cargo in a separate unit. If the vehicle itself weighs more than 26,000 pounds, Class B covers it. If you need to pull something behind it, you need a different class.
The exact vehicles allowed under Class B vary by state, but the pattern is consistent. You can drive a city transit bus, a school bus, a dump truck, a cement mixer truck, a large moving truck, or a motor home over the weight threshold. You cannot drive a semi truck with a trailer, a pickup truck towing a horse trailer, or a box truck towing additional cargo — those require a Class A license instead.
Class B exists because operating a heavy single vehicle requires different skills and awareness than driving a passenger car, but does not require the jackknife and backing skills that come with managing a tractor-trailer combination. The weight threshold of 26,000 pounds is federal, set by the Department of Transportation, so it does not change from state to state.
Key Takeaways
- Class B covers single vehicles weighing more than 26,000 pounds, such as large buses, dump trucks, and motor homes, but not combinations with trailers.
- You must pass a written knowledge test and a driving skills test specific to the vehicle type you plan to operate.
- Some states require a medical examination and vision test before issuing a Class B license.
- If you want to tow a trailer behind any vehicle, you need a Class A license instead, even if the towing vehicle itself qualifies for Class B.
How Class B differs from Class A and other license classes
The main difference between Class B and Class A is the trailer rule. A Class A license covers any combination of vehicles — a tractor pulling one or more trailers, or a heavy truck towing cargo. Class B covers only the single vehicle itself. If you hold a Class B and want to tow anything, you cannot legally do so without upgrading to Class A.
Class B also differs from a standard passenger license (usually Class D or C, depending on your state) in the testing and medical requirements. To get Class B, you must pass a written test on vehicle operation, weight distribution, braking systems, and safety rules specific to heavy vehicles. You also take a behind-the-wheel test in the actual vehicle type you will operate — a bus test is different from a truck test. A passenger license requires neither of these.
Some states place additional restrictions on Class B. A few require you to be at least 18 years old, while others set the minimum at 21. Some states require a medical certificate from a doctor before you can renew, similar to what commercial drivers need. Check your state's Department of Motor Vehicles website for the specific rules in your area.
What you need to study before taking the Class B test
The written test covers the mechanics and safety of operating a heavy vehicle. You will be tested on how weight affects braking distance, how to inspect brakes and tires on a large vehicle, how to load cargo safely (if applicable), and how to handle the vehicle in emergency situations. Most states provide a study guide — often called the Commercial Driver's License (CDL) manual or the Heavy Vehicle Operator's Manual — that covers all tested material.
The driving test takes place in the actual vehicle you plan to operate. If you are testing for a bus license, you drive a bus. If you are testing for a truck license, you drive a truck. The examiner watches how you handle the size and weight of the vehicle, how you use mirrors and blind-spot awareness, how you brake smoothly, and how you navigate turns and parking. The test usually lasts 30 to 45 minutes and covers both city driving and highway driving.
Some states also require a pre-test vehicle inspection, where you walk around the vehicle and point out safety features — lights, tires, mirrors, coupling devices — and explain what you are checking and why. This is not a pass-or-fail test in the traditional sense, but failing to identify obvious safety issues can result in test failure.
Medical and vision requirements for Class B
Many states require a medical examination before issuing a Class B license. The exam is usually performed by a doctor or certified medical examiner and checks your vision, hearing, blood pressure, and ability to operate controls. Vision requirements are typically 20/40 or better in each eye, with or without correction, and a field of vision of at least 70 degrees in each direction.
Some states require this medical exam only once, at initial issuance. Others require it at each renewal, usually every four or five years. A few states do not require a medical exam for Class B at all — they treat it as a non-commercial license. Your state's DMV can tell you whether an exam is required and where to get one.
If you have a medical condition — such as diabetes, epilepsy, or a heart condition — you may still be able to get a Class B license, but you may need additional documentation or restrictions on your license. For example, you might be required to wear corrective lenses, or your license might be restricted to daytime driving only. The examining doctor will advise you on what is possible in your case.
how the process works for a Class B license in your state
The process begins at your state's Department of Motor Vehicles (DMV) or equivalent agency. You will need to bring proof of identity (a passport or birth certificate), proof of residency (a utility bill or lease), your current driver's license, and proof of your Social Security number. Some states also require proof that you have taken a driver's education course or have a certain amount of driving experience.
Next, you take the written test at the DMV. This is usually a computer-based test with 50 to 100 questions, and you must score at least 80 percent to pass. If you fail, you can usually retake it the same day or within a few days. After you pass the written test, you schedule a driving test with an examiner.
The driving test is scheduled separately and may take place at a different location or on a different day. You must bring the vehicle you plan to operate — you cannot borrow a vehicle on test day. After you pass the driving test, the DMV issues your Class B license. The entire process typically takes two to four weeks from start to finish, though it can be faster if you pass both tests on your first attempt.
Restrictions and endorsements that may appear on Class B
Your Class B license may include endorsements — additional authorizations for specific vehicle types or cargo — or restrictions — limitations on when or how you can drive. Common endorsements include "P" for passenger vehicles (buses), "T" for double or triple trailers (though this requires Class A), and "H" for hazardous materials. Restrictions might include "L" for automatic transmission only, "D" for daytime driving only, or "V" for corrective lenses required.
Endorsements are added based on the vehicle type you tested in and the cargo you will carry. If you test in a school bus, you may receive a "P" endorsement. If you test in a hazmat truck, you may receive an "H" endorsement. Restrictions are added based on the medical exam or your test performance. If the examiner notes that you struggled with night driving, a "D" restriction may be added.
You can add endorsements later by passing an additional written test and, in some cases, a driving test. You can request that restrictions be removed by retesting or by providing updated medical documentation to the DMV.
When you need Class A instead of Class B
If you plan to tow any trailer — a cargo trailer, a horse trailer, a boat trailer, or a utility trailer — you need a Class A license, not Class B. This is true even if the towing vehicle itself weighs less than 26,000 pounds. The rule is based on the combined weight of the vehicle and trailer: if the combination exceeds 26,000 pounds, Class A is required.
You also need Class A if you plan to operate a tractor-trailer combination, a semi truck with a sleeper cab, or any vehicle designed to pull multiple trailers. Class A is a superset of Class B — it covers everything Class B covers, plus towing. If you are unsure whether your intended use requires Class A or Class B, contact your state's DMV or the company that will employ you.
Upgrading from Class B to Class A requires passing an additional written test and a driving test in a tractor-trailer or combination vehicle. The process is similar to the initial Class B test but focuses on coupling, uncoupling, and backing with a trailer.
Frequently Asked Questions
Can I drive a Class B vehicle with a regular passenger license?
No. If the vehicle weighs more than 26,000 pounds, you must have a Class B license or higher. Driving a heavy vehicle without the proper license is illegal and can result in fines, license suspension, and criminal charges. Your insurance may also deny a claim if you were driving without the correct license class.
What is the age requirement for a Class B license?
Most states require you to be at least 18 years old to obtain a Class B license. Some states set the minimum at 21, particularly for school bus drivers or hazmat endorsements. Check your state's DMV website for the specific age requirement in your area.
Do I need a Class B license to drive a large motor home?
Only if the motor home's gross vehicle weight rating exceeds 26,000 pounds. Many motor homes fall below this threshold and can be driven with a standard passenger license. Check the vehicle's registration or owner's manual for the GVWR, or ask the dealer. If it is over 26,000 pounds, Class B is required.
How long does a Class B license last?
Class B licenses typically expire every four to five years, depending on your state. Some states require a medical examination at each renewal, while others do not. Your renewal notice will tell you what documents to bring and whether a medical exam is needed.
Can I get a Class B license if I have a medical condition?
Possibly. Many medical conditions do not automatically disqualify you, but you may need additional documentation or restrictions on your license. The medical examiner will review your condition and advise you on what is possible. If you are denied, you can usually request a review or appeal the decision.