Learn About Class B CDL License Driving Requirements

What Is a Class B CDL License and When You Need One

A Class B Commercial Driver's License (CDL) is a type of driving credential that allows you to operate certain larger vehicles on public roads. Understanding what vehicles require this license is important if you work in transportation, delivery, or similar industries.

The Class B CDL covers vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, but only if the vehicle does not tow a trailer. This distinction matters because it separates Class B from Class A licenses. For example, a delivery truck that weighs 30,000 pounds by itself would require a Class B CDL. However, if that same truck towed a trailer, the driver would need a Class A license instead.

Common vehicles that require a Class B CDL include:

• City transit buses and school buses
• Delivery trucks (like those used for package delivery or food distribution)
• Dump trucks without attached trailers
• Concrete mixer trucks
• Garbage trucks
• Tank trucks without trailers
• Tow trucks that weigh over 26,001 pounds

It is important to note that weight matters significantly. A vehicle under 26,001 pounds GVWR generally does not require any CDL, even if it is used commercially. A truck that weighs exactly 26,000 pounds likely requires only a regular driver's license. However, a truck weighing 26,001 pounds or more requires a Class B CDL at minimum.

If you currently drive any of these vehicle types without a CDL, you may be violating state and federal laws. Each state enforces CDL requirements, and violations can result in fines, vehicle impoundment, and criminal charges in some cases. Understanding whether your job requires a Class B CDL is the first step toward legal compliance.

Practical Takeaway: Check your vehicle's registration documents or door placard to find the GVWR. If it exceeds 26,001 pounds and you drive it for work, research your state's specific CDL requirements to confirm whether you need a Class B license.

Age, Medical, and Basic Requirement Standards

Before pursuing a Class B CDL, you must meet several foundational requirements set by the Federal Motor Carrier Safety Administration (FMCSA) and your state's Department of Motor Vehicles. These rules exist to protect public safety on roads.

The minimum age to hold a Class B CDL is 18 years old for intrastate driving (driving only within your home state). If you plan to drive across state lines (interstate commerce), you must be at least 21 years old. Some states have additional age restrictions or requirements, so checking your specific state's rules is necessary.

You must hold a valid regular driver's license before obtaining a CDL. Your regular license cannot be suspended, revoked, or expired. If your license has been suspended for any reason—traffic violations, unpaid fines, or medical issues—you will not be able to obtain a CDL until the suspension is resolved.

Medical certification is a major requirement. You must pass a Department of Transportation (DOT) physical examination conducted by a certified medical examiner. This exam checks:

• Vision (at least 20/40 in each eye, with or without correction, and a 70-degree field of vision)
• Hearing (ability to perceive a forced whisper at three feet)
• Blood pressure (generally must be below 160/100)
• Blood sugar control if you have diabetes
• Heart function and absence of certain conditions
• Respiratory function
• Neurological conditions
• Drug and alcohol history

If you have certain medical conditions—such as severe hearing loss, uncontrolled high blood pressure, or a history of seizures—you may not be approved for a CDL. Some conditions may require a waiver or special certification. The medical examiner will provide a Medical Examiner's Certificate (MEC) valid for up to two years if you pass.

You must also have a Social Security Number and proof of citizenship or legal residency. States typically require a state ID, proof of address, and Social Security documentation to process your CDL application.

Practical Takeaway: Schedule a DOT physical with a certified medical examiner before starting the CDL process. This exam often takes several weeks to schedule, and it is not part of the standard DMV medical check. Knowing in advance whether you will pass this exam prevents wasted time and effort.

Written Knowledge Tests and What to Study

Obtaining a Class B CDL requires passing written tests that measure your understanding of safe commercial driving practices. These tests are different from regular driver's license tests and cover material specific to operating larger vehicles.

You must pass the General Knowledge Test, which covers topics applicable to all CDL holders. This test typically includes 50 questions, and you must answer at least 40 correctly (80%) to pass. The test covers topics such as vehicle inspection, hazardous materials awareness, safety regulations, and proper use of safety equipment.

For Class B CDL specifically, you must also pass the Passenger Vehicle Test. This test applies because many Class B vehicles carry passengers, such as school buses or transit buses. The test covers passenger safety, loading procedures, emergency equipment, and evacuation procedures. This test typically contains 20 questions, and you must score at least 16 correctly (80%).

Some Class B drivers may need additional endorsements depending on their work. A passenger (P) endorsement is required to drive buses with 16 or more passengers. A school bus (S) endorsement is required to drive school buses. A hazmat (H) endorsement is needed if you transport hazardous materials. Each endorsement requires its own test.

Common topics covered on Class B CDL knowledge tests include:

• Pre-trip vehicle inspection procedures
• Proper tire maintenance and safety
• Brake system operation and anti-lock brakes
• Steering and handling techniques for larger vehicles
• Speed control on curves and hills
• Safe backing procedures
• Weight distribution and load securement
• Accident procedures and emergency response
• Hours of service regulations (maximum driving times)
• Drug and alcohol policy
• Vehicle lighting and signaling
• Road hazards and defensive driving

Most states provide study materials through the DMV website or office. The official CDL handbook for your state contains most of the information covered on the tests. Many commercial driving schools also offer study guides and practice tests. Studying the handbook thoroughly and taking practice tests several times before the actual exam significantly increases your chances of passing on the first attempt.

You will typically take the knowledge tests at your state's DMV or an approved testing location. Many states allow computer-based testing, which you may retake after a waiting period if you fail. Some states allow only a certain number of retakes within a set time frame, so passing on the first or second attempt is preferable.

Practical Takeaway: Obtain your state's official CDL handbook and read it cover to cover at least twice. Take at least three practice tests before scheduling your actual exam. Focus extra study time on the Passenger Vehicle section, as this is specific to Class B and often catches unprepared test-takers.

The Skills Test and Hands-On Driving Assessment

After passing written knowledge tests, you must pass a practical skills test that demonstrates your ability to safely operate a Class B commercial vehicle. This test has three components: a pre-trip inspection, a basic control skills test, and an on-road driving test.

The pre-trip inspection test requires you to walk around and inspect a Class B vehicle while an examiner observes and asks questions. You must identify critical components and explain what you are checking and why. The examiner may ask you about lights, brakes, mirrors, tires, wipers, horns,