A CDL requires a written test, a skills test, and a valid regular driver's license

A Commercial Driver's License (CDL) is a separate credential from your regular driver's license. You cannot get one without already holding a valid standard license in your state. The process involves passing a written knowledge test specific to the type of vehicle you want to drive, then passing a behind-the-wheel skills test with an examiner. Most states also require a medical certificate showing you meet federal health standards for commercial driving.

The timeline varies by state, but you should expect the written test to happen first, followed by the skills test within a few weeks. Some states allow you to take both on the same day if you pass the written portion. You will pay separate fees for the written test, the skills test, and the CDL license itself — these are not combined into one fee.

You do not need to attend a commercial driving school to get a CDL, though many drivers do. Some states allow you to study on your own and test directly with the Department of Motor Vehicles. Others require formal training through an approved program before you can sit for the skills test. Check your state's rules before you start.

Key Takeaways

  • You must hold a valid regular driver's license before you can test for a CDL in any state.
  • The written test covers vehicle operation, safety, and regulations specific to the class of truck you want to drive.
  • The skills test includes a pre-trip inspection, a backing exercise, and an on-road drive with a state examiner.
  • Most states require a Department of Transportation medical certificate before you can be issued a CDL.
  • Some states require formal training through an approved school; others allow self-study before testing.

The written knowledge test and what it covers

The written test is a multiple-choice exam administered by your state's Department of Motor Vehicles or equivalent agency. The number of questions and passing score vary by state, but most require you to answer 30 to 50 questions and score at least 80 percent correct. You typically have one or two hours to complete it.

The test covers general knowledge required of all CDL holders — vehicle inspection, safe driving practices, cargo securement, and federal regulations. If you are testing for a specific endorsement (tanker, hazmat, passenger), you will take an additional endorsement-specific test. The general knowledge section is the same regardless of what you drive.

Most states allow you to study using their official CDL manual, which is free and available online or in print at the DMV. Some states also offer practice tests. You can retake the written test if you fail, though there is usually a waiting period of a few days between attempts, and you may have to pay the test fee again.

The skills test: pre-trip inspection, backing, and road drive

The skills test has three parts, all administered by a state examiner on the same day. You bring your own truck or rent one from a testing facility. The examiner watches you perform each task and scores you on safety, technique, and knowledge.

The pre-trip inspection requires you to walk around and under the vehicle, pointing out and explaining the condition of critical components — brakes, lights, tires, coupling devices, and safety equipment. You do not have to fix anything; you are demonstrating that you know what to look for and what would make the vehicle unsafe to drive. This portion usually takes 15 to 20 minutes.

The backing exercise tests your ability to maneuver the truck in a confined space. You are typically asked to back into a marked lane or dock area without hitting cones or boundaries. This is often the hardest part for first-time test takers. You get one or two attempts depending on your state.

The on-road drive lasts 30 to 60 minutes. The examiner directs you through city streets, highways, and residential areas, observing how you handle acceleration, braking, turning, lane changes, and interaction with other traffic. You must follow traffic laws exactly — any violation can result in an automatic failure.

Medical certification and DOT physical requirements

Before you can be issued a CDL, you must pass a Department of Transportation (DOT) medical examination performed by a certified medical examiner. This is not your regular doctor's checkup. The examiner is specifically trained to assess whether you meet federal standards for commercial driving — vision, hearing, blood pressure, diabetes control, and other conditions that affect safe operation of large vehicles.

If you pass, the examiner issues a Medical Certificate valid for two years (or one year if you have certain conditions). You present this certificate when you explore for your CDL. If you fail, you may be issued a temporary certificate with restrictions, or you may be denied until you address the medical issue.

Some conditions — uncontrolled high blood pressure, certain heart conditions, untreated sleep apnea, or poor vision — can disqualify you. Others require documentation that you are managing the condition (for example, a letter from your doctor confirming your diabetes is controlled). The examiner will tell you what is needed if your condition requires follow-up.

State-by-state differences in training requirements

About half of all states require you to complete training at an approved Commercial Driver Training School before you can test for your CDL. The other half allow you to study independently and test directly. A few states have a middle ground: you can test without formal training, but if you fail the skills test, you must attend school before retesting.

If your state requires training, the school must be on your state's approved list. Training programs typically run 3 to 8 weeks and include classroom instruction, simulator time, and behind-the-wheel training in an actual truck. You pay tuition separately from the test fees. Some schools offer payment plans or financing.

If your state allows self-study, you can prepare using the official CDL manual, online resources, and practice tests. Many drivers still choose to attend a school even when not required, because the hands-on instruction and feedback improve their chances of passing the skills test on the first attempt.

To find out whether your state requires training, check your state's DMV website or call the CDL section directly. The requirement applies to first-time CDL holders; if you already hold a CDL and are adding an endorsement, the rules may differ.

Fees, timelines, and what to bring to the test

CDL fees vary significantly by state. The written test typically costs $10 to $50. The skills test costs $50 to $300 depending on whether you use your own truck or rent one from the testing facility. The CDL license itself costs $20 to $100. Medical certification costs $50 to $200. If you attend a training school, tuition ranges from $3,000 to $7,000 or more.

The total timeline from start to CDL in hand is usually 4 to 12 weeks if you are self-studying, or 6 to 16 weeks if you attend a training school. The written test can often be scheduled within days. The skills test may have a longer wait depending on how many examiners your state has and how busy they are.

On test day, bring your valid regular driver's license, proof of your DOT medical certificate, proof of your state residency, and proof of your Social Security number. Some states also require proof of citizenship or legal presence. Check your state's DMV website for the exact list before you go.

Frequently Asked Questions

Can I get a CDL if I have a suspended or revoked regular driver's license?

No. Your regular license must be valid and in good standing. If it is suspended or revoked, you must restore it first. Some states have a waiting period before you can restore a suspended license, so contact your DMV to find out the timeline.

What happens if I fail the skills test?

You can retake it after a waiting period, usually a few days to a week. You pay the test fee again. Some states limit how many times you can retake the test in a certain period. If you fail multiple times, your state may require you to attend a training school or take additional instruction before retesting.

Do I need my own truck to take the skills test?

Not necessarily. Many testing facilities rent trucks specifically for the skills test. You pay a rental fee (usually $50 to $150) in addition to the test fee. If you use your own truck, it must be the class you are testing for and must pass a safety inspection before the test begins.

How long is a CDL valid?

A CDL is typically valid for four or five years, depending on your state. You renew it at your DMV before it expires. You do not have to retake the written or skills test to renew — you just pay the renewal fee and provide an updated medical certificate.

Can I test for multiple endorsements at the same time?

Yes. You take the general knowledge test once, then take a separate written test for each endorsement you want. The skills test is the same regardless of how many endorsements you are testing for. You pay a separate fee for each endorsement test.