What you need to get a commercial driver's license

A commercial driver's license (CDL) requires you to pass a written knowledge test, a skills test behind the wheel, and a medical examination. You must also hold a valid regular driver's license first, be at least 18 years old (21 for interstate driving), and pass a background check. The entire process typically takes four to eight weeks from start to finish, though the timeline depends on how quickly you schedule tests and whether you need to retake any portion.

Each state administers its own CDL program, so requirements vary slightly by location. Some states require you to complete a formal training course before testing; others do not. The written test covers federal regulations, vehicle operation, and safety procedures specific to the class of truck you want to drive. The skills test is conducted by an examiner who watches you perform pre-trip inspections, basic control movements, and on-road driving.

Key Takeaways

  • You must hold a valid regular driver's license, pass a Department of Transportation medical exam, and be at least 18 years old before you can test for a CDL.
  • The written knowledge test covers federal motor carrier safety regulations and vehicle-specific procedures; you can study using your state's CDL manual, which is free online.
  • The skills test includes a pre-trip inspection, basic control movements in a parking lot, and on-road driving evaluated by a state examiner.
  • Some states require completion of a training course before you test; others allow you to study independently and test on your own schedule.
  • Endorsements for hazmat, tanker, or passenger transport require additional written tests and background checks beyond the base CDL.

Medical certification and background requirements

Before you can test for a CDL, you must pass a Department of Transportation (DOT) medical examination conducted by a certified medical examiner. This exam checks your vision, hearing, blood pressure, and overall fitness to operate a commercial vehicle safely. The examiner will review your medical history, including any conditions like diabetes or sleep apnea that could affect your ability to drive. If you pass, you receive a Medical Certificate valid for two years (or one year if you have certain medical conditions).

You will also undergo a background check that includes a review of your driving record and criminal history. States disqualify drivers with serious traffic violations, DUI convictions, or felonies involving drugs or violence. The specific offenses that disqualify you vary by state, but federal law prohibits anyone convicted of certain crimes from holding a CDL. You can contact your state's Department of Motor Vehicles to learn which offenses in your record might block you.

The written knowledge test and study materials

The CDL written test is administered at your state's DMV or testing center and covers three main areas: general knowledge (federal regulations, vehicle operation, safety), air brakes (if you will drive a vehicle with air brakes), and the specific class of vehicle you want to drive. The test typically consists of 50 to 100 multiple-choice questions, and you must score at least 80 percent to pass. You can retake the test if you fail, though some states require you to wait a set number of days between attempts.

Your state's CDL manual is the primary study resource and is available free online through your state's DMV website. The manual covers everything the test will ask about: hours-of-service rules, vehicle inspection procedures, hazard perception, and emergency maneuvers. Many drivers also use third-party study guides or practice tests available online, though the official manual is sufficient. Most people spend two to four weeks studying before testing, depending on their familiarity with trucking regulations.

The skills test: what happens during the exam

The skills test has three parts, all conducted on the same day by a state-certified examiner. First is the pre-trip inspection, where you walk around the vehicle and point out critical safety components—lights, brakes, tires, mirrors, coupling devices—and explain what you are checking for. You do not have to take the vehicle apart; you are demonstrating that you know what to look for and why it matters.

Second is the basic control movements portion, conducted in a closed course or large parking lot. You maneuver the vehicle through a series of exercises: backing in a straight line, backing into an offset alley, and performing a 90-degree turn. These movements test your ability to control a large vehicle in tight spaces. The examiner watches for smooth steering, proper mirror use, and awareness of the vehicle's size and blind spots.

Third is the on-road driving test, typically 30 to 60 minutes long, where you drive on public roads while the examiner observes. You will encounter traffic, turns, hills, and highway driving. The examiner is looking for safe speed selection, proper lane positioning, smooth braking, and appropriate use of mirrors and signals. You must follow all traffic laws and demonstrate that you can handle the vehicle safely in real-world conditions.

Training courses and whether you need one

Some states require you to complete a formal CDL training program before you can test; others allow you to study independently and test on your own. Training programs range from three weeks to several months and typically cost between $3,000 and $7,000, though costs vary widely by provider and location. Programs include classroom instruction on regulations, hands-on vehicle operation, and practice driving with an instructor.

If your state does not require training, you can study the manual on your own and schedule your tests directly with your state's DMV. However, many drivers choose to attend a training program anyway because it provides structured instruction, access to a truck for practice, and feedback from experienced instructors. Some employers also require or prefer drivers who have completed a formal program. Check your state's DMV website to learn whether training is mandatory in your state.

Endorsements for specialized driving

A base CDL allows you to drive most commercial trucks, but certain cargo and vehicle types require additional endorsements. The most common are Hazmat (hazardous materials), Tanker, Passenger, and Double/Triple Trailers. Each endorsement requires you to pass an additional written test covering the specific regulations and safety procedures for that cargo or vehicle type. Hazmat endorsements also require a Transportation Security Administration (TSA) background check, which can take several weeks.

You can test for endorsements at the same time you test for your base CDL, or you can add them later. If you add them later, you only take the endorsement test; you do not retake the base CDL test. Some employers require certain endorsements before hiring, so check job postings in your field to see which ones are most valuable.

Timeline and next steps after passing

From the time you decide to pursue a CDL to the time you hold a valid license typically takes four to eight weeks. The first step is obtaining your Medical Certificate, which you can schedule when ready; the exam usually takes 30 to 60 minutes. Next, you study for and take the written test, which you can do within one to two weeks. After passing the written test, you schedule the skills test, which may have a wait depending on your state's testing capacity. Once you pass the skills test, your CDL is issued, usually within a few days.

After you receive your CDL, you can begin working as a commercial driver. Your license is valid for four to eight years depending on your state. You must renew it before it expires and may need to renew your Medical Certificate more frequently. Some employers require additional training or certifications beyond the CDL, so check with potential employers about their specific requirements.

Frequently Asked Questions

Do I need a regular driver's license before I can get a CDL?

Yes. You must hold a valid regular driver's license in your state before you can test for a CDL. Your regular license must be clean enough to pass the background check; serious violations or suspensions can disqualify you. Some states require you to hold your regular license for a minimum period before testing for a CDL.

What happens if I fail the skills test?

You can retake it. Most states allow you to schedule another test within a few days or weeks. You do not have to retake the written test unless your state requires you to. Some states charge a fee for each retake. Many people pass on their second or third attempt, especially if they get additional practice or training between attempts.

Can I test for a CDL if I have a DUI on my record?

It depends on when the DUI occurred and your state's rules. Federal law disqualifies drivers with certain convictions, but the specifics vary. Contact your state's DMV directly with details of your conviction; they can tell you whether you are disqualified or whether you can proceed with testing.

How much does it cost to get a CDL?

Costs vary by state and whether you attend a training program. Testing fees alone (written and skills tests) typically range from $100 to $300. If you attend a formal training program, add $3,000 to $7,000. The Medical Certificate exam costs $50 to $200. Budget $3,500 to $8,000 total if you include training.

Can I get a CDL if I am under 21?

Yes, you can get a CDL at 18, but you can only drive within your state. Federal law prohibits drivers under 21 from driving interstate (across state lines). Once you turn 21, you can explore for an unrestricted CDL that allows interstate driving. Some states have additional age restrictions for certain endorsements.