What a Class B CDL is and who needs one

A Class B Commercial Driver's License lets you drive single vehicles over 26,001 pounds gross vehicle weight rating (GVWR), or any vehicle towing a trailer under 10,001 pounds. The most common Class B job is driving a straight truck — a dump truck, box truck, or delivery vehicle where the cargo sits on the same frame as the cab. You do not need a Class B if you drive a pickup truck for personal use, even if it weighs more than 26,000 pounds, because personal use is exempt from CDL rules.

States issue Class B licenses, not the federal government, so requirements vary slightly by state. However, the written test, skills test, and medical certificate are standardized across all states. You will need to pass all three before you can legally drive a commercial vehicle for pay.

Key Takeaways

  • You must obtain a valid medical certificate from a Department of Transportation (DOT) medical examiner before you can test for a Class B CDL.
  • The written test covers vehicle inspection, safe driving practices, and air brake systems (if your truck has them), and you must score at least 80 percent on each section.
  • The skills test includes a pre-trip inspection, a backing exercise, and an on-road driving test, all performed in the actual vehicle you will drive.
  • Most states require you to hold a valid Class B commercial learner's permit for at least one day before you can take the skills test, though some allow same-day testing.
  • The entire process typically takes two to four weeks from medical exam to license, depending on how quickly you schedule tests and whether you pass on your first attempt.

Getting your DOT medical certificate first

Before you can even take the written test, you must have a DOT medical certificate in your possession. This is not optional — the testing facility will ask to see it. The certificate comes from a medical examiner listed on the Federal Motor Carrier Safety Administration (FMCSA) National Registry. You can find examiners in your area at the FMCSA website under "Medical Examiner Search."

The exam itself is straightforward: blood pressure, vision, hearing, and a review of your medical history. It costs between $100 and $200 depending on the examiner. The certificate is valid for two years. If you fail the exam — usually because of uncontrolled high blood pressure or vision problems — you can retest after addressing the issue, but some conditions may require a specialist's clearance first.

Passing the written test for Class B

The written test has three sections: General Knowledge, Combination Vehicles (if you will tow a trailer), and Air Brakes (if your truck has an air brake system). You must score at least 80 percent on each section you take. Most Class B drivers take General Knowledge and Air Brakes; Combination Vehicles is optional unless your job requires towing.

Each section has between 20 and 50 questions, and you have a set time limit — usually 60 minutes per section. The test covers pre-trip inspection procedures, weight distribution, stopping distance, brake failure recovery, and vehicle control in emergency situations. You can study using your state's CDL manual, which is free and available online from your state's Department of Motor Vehicles (DMV) website.

After you pass all written sections, the testing officer will issue you a commercial learner's permit (CLP). This permit lets you drive a commercial vehicle only while supervised by a licensed Class B or higher driver. You cannot drive alone.

Scheduling and passing the skills test

The skills test has three parts: pre-trip inspection, backing maneuvers, and on-road driving. You must perform all three in the same vehicle you intend to drive professionally — a testing facility's truck, a truck your employer provides, or a truck you rent. The entire test takes about 90 minutes.

In the pre-trip inspection, you walk around and under the truck, pointing out safety components and explaining what you are checking. The examiner is looking for knowledge, not perfection — you do not have to find every problem, but you must demonstrate you know what to look for. In the backing exercise, you reverse the truck into a marked space or around obstacles. In the on-road portion, you drive in traffic, make turns, and demonstrate smooth braking and acceleration.

Most states require you to hold your CLP for at least one day before testing, though a few allow same-day testing. Check your state's rules before scheduling. If you fail any section, you can retake it, but you usually must wait a set number of days (often 7 to 14) before trying again.

Timing and costs for the full process

The medical exam takes one appointment and costs $100 to $200. The written test is usually free or costs $10 to $30 and can be taken the same day you get your medical certificate. The skills test costs $100 to $300 depending on whether you use a third-party tester or your state's DMV, and whether you provide your own truck or rent one.

From start to finish, most people complete the process in two to four weeks. The bottleneck is usually scheduling the skills test, because examiners have limited availability and may have a waiting list. If you fail the written test, add another week or two for studying and retesting. If you fail the skills test, add another two to three weeks before your next attempt.

What happens after you pass

Once you pass the skills test, your state will issue your Class B CDL within one to two weeks. You will receive a physical card in the mail. Your CLP remains valid until the card arrives, so you can drive commercially during that gap if your employer needs you to.

Your Class B license is valid for four or five years depending on your state, and you must renew it before it expires. Renewal usually requires passing a written test again and renewing your medical certificate, though some states allow mail-in renewal if you have no violations. Your medical certificate must remain current at all times — if it expires, you cannot legally drive a commercial vehicle, even if your license is still valid.

Frequently Asked Questions

Can I take the written test and skills test on the same day?

Most states require you to hold your commercial learner's permit for at least one day before taking the skills test, so same-day testing is not possible in those states. A few states allow same-day testing if you pass the written exam in the morning and schedule the skills test for the afternoon. Check your state's DMV website or call your local testing facility to confirm the rule.

What if I fail the skills test?

You can retake the skills test after a waiting period, usually 7 to 14 days. Your CLP remains valid during this time. You do not need to retake the written test unless your CLP expires. Most people pass on the second or third attempt after practicing with a mentor or professional trainer.

Do I need to take a Class B CDL course?

No course is required by law, but many employers prefer or require new drivers to complete a commercial driver training program before hiring. These programs typically last three to six weeks and include classroom instruction, simulator practice, and behind-the-wheel training. They cost $3,000 to $7,000 but can improve your chances of passing the skills test on your first attempt.

What disqualifies you from getting a Class B CDL?

Serious traffic violations, DUI convictions, reckless driving, and certain medical conditions can disqualify you. A failed DOT medical exam is the most common barrier. Some states also disqualify drivers with multiple moving violations in the past three to five years. Check your state's disqualification rules on the DMV website.

Can I get a Class B CDL if I have a suspended or revoked license?

No. Your regular driver's license must be valid and in good standing. If your license is suspended or revoked, you must restore it first. Once restored, you can begin the CDL process. The timeline for restoration varies by state and the reason for suspension.