Free Guide to Class B CDL License Requirements

What Is a Class B CDL License and Who Needs One

A Class B Commercial Driver's License (CDL) is a permit issued by your state that allows you to operate certain types of commercial vehicles. The Federal Motor Carrier Safety Administration (FMCSA) sets federal standards, but each state administers its own CDL program with specific rules and requirements.

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A Class B CDL covers vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, but only if you are not towing a trailer, or if you're towing a trailer with a GVWR of 10,000 pounds or less. This is different from a Class A CDL, which allows you to operate heavier combination vehicles and tractor-trailers.

Common vehicles that require a Class B CDL include:

• Straight trucks (like dump trucks, box trucks, and delivery trucks)
• Buses that carry 16 or more passengers (including the driver)
• Articulated buses (city transit buses with a joint in the middle)
• Vehicles carrying hazardous materials in quantities that require placarding
• School buses that transport students (in most states)

You need a Class B CDL if your job involves operating any of these vehicles commercially. "Commercially" means you're being paid to drive, or the vehicle is being used in a business context. According to the U.S. Bureau of Labor Statistics, there were approximately 1.87 million heavy truck drivers and 500,000 bus drivers in the United States as of recent data, representing a significant portion of the workforce that holds CDL licenses.

If you only drive a personal vehicle or operate a vehicle under the GVWR thresholds without hazardous materials, you do not need a CDL. Regular passenger vehicles, light trucks, and vans fall under standard driver's license categories.

Practical Takeaway: Review the specific GVWR of any vehicle you operate for work. Check your vehicle's door jamb or registration paperwork for this number. If it's 26,001 pounds or more, or if you're driving a bus with 16+ passengers, you'll need a Class B CDL.

Basic Age, Residency, and Medical Requirements

Before pursuing a Class B CDL, you must meet several foundational requirements that vary slightly by state but follow federal guidelines. Understanding these baseline criteria helps you determine whether you can move forward with the licensing process.

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Age requirements are the first checkpoint. Federal rules state that you must be at least 21 years old to drive a commercial vehicle across state lines or transport hazardous materials. However, many states allow 18-year-olds to obtain a Class B CDL for intrastate commerce (driving only within your state). Some states are stricter and require 21 years old for all CDL holders. You should check your state's Department of Motor Vehicles (DMV) website to confirm the exact age rule where you live.

Residency requirements state that you must obtain your CDL from the state where you live. You cannot shop around to different states looking for easier testing or lower standards. You must hold a valid non-commercial driver's license (or be able to pass the written test for one) before obtaining a CDL. Your license must not be suspended, revoked, or cancelled in any state.

Medical certification is a critical requirement. The FMCSA requires all CDL holders to pass a Department of Transportation (DOT) medical examination performed by a certified medical examiner. This examination includes:

• Vision testing (must be at least 20/40 in each eye, corrected or uncorrected)
• Hearing test (must be able to perceive a whispered voice at 5 feet)
• Blood pressure check (must not exceed 160/100)
• Urine testing for protein and sugar
• Review of medical history and current medications
• Physical examination of reflexes, balance, and general health

Certain medical conditions may prevent you from obtaining a CDL or require special evaluation. These include epilepsy, diabetes requiring insulin (though some states have waiver programs), cardiovascular disease, sleep apnea, and substance use disorders. A certified medical examiner will review your specific situation.

After passing the medical examination, you'll receive a Medical Certificate (Form MCSA-5875), which is valid for two years. You must carry this certificate with you while driving commercially. Without it, you cannot legally operate a commercial vehicle, even if you've passed all other tests.

Practical Takeaway: Schedule your DOT medical examination early—don't wait until after you've passed your CDL written test. Find a certified medical examiner through your state's DMV or the FMCSA's National Registry of Certified Medical Examiners online. Bring your insurance information, medication list, and any relevant medical records to the appointment.

Written Knowledge Tests and Testing Process

The Class B CDL written test is designed to measure your knowledge of vehicle operation, safety regulations, and road rules specific to commercial driving. The testing process is standardized across all states but administered through your local state DMV office.

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The written test for a Class B CDL consists of 50 multiple-choice questions covering the General Knowledge section, which every CDL holder must pass. You must answer at least 40 questions correctly (80%) to pass. The test covers topics such as vehicle inspection, braking systems, cargo securement, safety equipment, hazard perception, and basic control of the vehicle.

Depending on the type of vehicle you'll operate, you may also need to pass additional endorsement tests:

• Passenger (P) Endorsement: Required if you'll drive buses with 16 or more passengers. This 20-question test covers passenger safety, loading procedures, and emergency situations.
• Hazardous Materials (H) Endorsement: Required if you'll transport certain hazardous materials. This 30-question test covers DOT hazmat regulations, placarding, and loading procedures.
• School Bus (S) Endorsement: Required if you'll drive a school bus. This 20-question test covers student safety and special school bus regulations.

Most states allow you to take written tests on a computer at the DMV, though some still use paper tests. You typically have three to five attempts to pass each test, with a waiting period (usually 7 days) between retakes if you fail. Test fees vary by state, ranging from $20 to $100 total for all required tests.

Preparation materials are widely available. The FMCSA publishes the Commercial Driver's License Manual, which contains all material covered on the tests. Many states make this manual available for free on their DMV websites. Additionally, numerous third-party study guides, practice tests, and preparation courses exist online and in print. Studying for 2 to 4 weeks, depending on your current knowledge, is typical for someone preparing without formal training.

When you arrive at the DMV for testing, you'll need to bring your valid driver's license, proof of residency (utility bill or lease), your social security number, and your Medical Certificate. The process typically takes 1 to 2 hours from start to finish if you're taking multiple tests.

Practical Takeaway: Obtain your state's official CDL manual and work through sample practice tests for at least two weeks before your scheduled test date. Many free practice tests are available online through your state's DMV or third-party sites. Take the tests in a quiet environment and time yourself to mimic real testing conditions.

Skills Test, Vehicle Inspection, and Road Examination

Passing the written test is only half the battle. You must also pass a practical skills test that includes three components: a pre-trip vehicle inspection, a basic control skills test, and an on-road driving test. All three are conducted by an FMCSA-approved examiner, either through your state's DMV or an accredited third-party testing facility.

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The pre-trip vehicle inspection portion requires you to conduct a systematic walk-around