What a Class B license lets you drive and who needs one

A Class B license lets you drive single vehicles over 26,001 pounds gross vehicle weight rating (GVWR) — typically large trucks, buses, and RVs — without a trailer. If you want to tow a trailer behind a Class B vehicle, you'll need a Class A instead. The specific weight thresholds and vehicle categories vary slightly by state, but the core rule is consistent: Class B covers heavy single vehicles only.

You need a Class B if your job requires driving a dump truck, cement mixer, delivery truck, city bus, or large RV. Some people get one for personal use — to haul equipment or live full-time in a motorhome. The requirements are stricter than a regular driver's license because these vehicles demand more skill and pose greater risk on the road.

Key Takeaways

  • A Class B license covers single vehicles over 26,001 pounds GVWR but not trailers; if you need to tow, you need Class A instead.
  • You must pass a written knowledge test, a skills test (backing, turning, stopping), and a medical examination before you can get one.
  • The medical exam is done by a certified examiner and checks vision, hearing, and ability to operate heavy equipment safely.
  • Most states require you to hold a valid regular driver's license first and be at least 18 years old, though some require 21 for certain vehicle types.
  • The entire process typically takes several weeks to a few months, depending on how quickly you schedule tests and how many attempts you need.

Age requirements and what license you need before explore

Most states require you to be at least 18 years old to get a Class B license, though some set the minimum at 21 for certain heavy vehicles like buses. You must already hold a valid regular driver's license (Class D or equivalent in your state) before you can get a commercial license. Some states let you hold both at the same time; others require you to surrender your regular license and replace it with the commercial one.

Check your state's Department of Motor Vehicles (DMV) or equivalent agency for the exact age rule in your area, because it varies. If you're under the minimum age but want to start preparing, you can study the Class B manual and get familiar with the material while you wait to reach the required age.

The written knowledge test and what it covers

Before you take the skills test, you must pass a written exam on Class B vehicle operation. The test covers air brake systems, vehicle inspection, safe driving practices, load securement, and how to handle emergencies like brake failure or tire blowouts. Most states give you 50 to 100 questions, and you typically need to score 80 percent or higher to pass.

Your state's DMV publishes a free Class B manual (sometimes called the Commercial Driver's License manual or CDL manual) that covers all the material on the test. You can read it from the DMV website or pick up a printed copy at your local office. Many people study for two to four weeks before taking the test. You can retake it if you fail, though some states charge a fee for each attempt.

The medical examination and what examiners check

You must pass a medical exam performed by a certified medical examiner listed on the National Registry of Certified Medical Examiners. This is not your regular doctor — it has to be someone specifically certified for commercial driver medical clearance. The exam checks your vision (usually 20/40 or better in each eye), hearing, blood pressure, ability to use your limbs, and any conditions that might affect your ability to operate a heavy vehicle safely.

The examiner will ask about your medical history, any medications you take, and whether you have conditions like diabetes, heart disease, or sleep apnea. If you pass, they issue a Medical Certificate (Form MCSA-5875) valid for two years. If you fail, you may be able to get a waiver or conditional certificate depending on your state and the condition in question. The exam usually costs $75 to $150 out of pocket.

The skills test: what you'll be asked to do

The skills test has three parts: a pre-trip vehicle inspection, a backing and maneuvering test, and an on-road driving test. During the pre-trip, you walk around and under the vehicle, checking brakes, lights, tires, mirrors, and safety equipment while explaining what you're looking for to the examiner. This typically takes 15 to 20 minutes.

The backing and maneuvering test takes place in a closed course with cones or marked lanes. You'll be asked to back in a straight line, back into an alley (a tight space between two lines), perform a 90-degree offset maneuver, and sometimes do a parallel park. These test your ability to control a large vehicle in tight spaces. The on-road test lasts 30 to 60 minutes and covers acceleration, braking, turning, lane changes, and how you handle traffic and road hazards. You drive the actual vehicle you'll be tested in, so if you're getting a Class B for a specific truck or bus, practice in that vehicle.

How to schedule your tests and what documents to bring

Contact your state's DMV to schedule the written test first — you can usually do this online or by phone. Bring your current driver's license, proof of residency (utility bill or lease), and your Social Security number or state ID number. Some states require you to bring the Medical Certificate before you can take the skills test, so get that done early.

For the skills test, you'll need to bring the same documents plus proof that you own or have permission to use the vehicle you're testing in. Some DMVs require a letter from the vehicle owner or your employer. Schedule the skills test only after you've passed the written exam and received your Medical Certificate. Many testing facilities book weeks or months in advance, so plan ahead. If you fail any test, you can usually retake it within a few days to a few weeks, depending on your state's rules.

Costs and timeline from start to finish

The total cost varies by state but typically ranges from $200 to $500. The written test usually costs $20 to $50, the medical exam $75 to $150, and the skills test $100 to $300. Some states charge additional fees for license issuance or renewal. If you need to retake any test, add the test fee again.

The timeline depends on how quickly you study and schedule tests. Most people spend two to four weeks studying for the written exam, then another week or two waiting for a testing appointment. The medical exam can usually be scheduled within a week or two. The skills test often has the longest wait — anywhere from two weeks to two months depending on how busy your local testing facility is. From the day you start studying to the day you receive your license in the mail, expect three to four months in most cases.

Frequently Asked Questions

Do I need a Class B license to drive my own RV?

Only if your RV's GVWR exceeds 26,001 pounds. Many smaller RVs fall under that threshold and can be driven with a regular license. Check your RV's registration or owner's manual for the GVWR. If it's over the limit, you need a Class B.

What happens if I fail the skills test?

You can retake it, usually within a few days to a few weeks depending on your state. There's typically a fee for each attempt. Many people pass on the second or third try after getting more practice time in the vehicle.

Can I use someone else's vehicle for the skills test?

Yes, as long as you have written permission from the owner and the vehicle meets your state's requirements for testing. The vehicle must be properly registered and insured, and it must be the type of Class B vehicle you're testing for.

Do I need air brake endorsement to get a Class B license?

Not automatically, but if the vehicle you'll be driving has air brakes, you must pass an air brake test. Many Class B vehicles have air brakes, so check your vehicle's specifications. If you pass the air brake test, it's noted on your license.

What if I have a medical condition that might affect my ability to drive?

Tell the medical examiner during your exam. Conditions like diabetes, heart disease, or sleep apnea don't automatically disqualify you, but the examiner needs to know. You may receive a conditional certificate or waiver depending on the condition and your state's rules.