What you need to do to get a CDL
A Commercial Driver's License (CDL) is issued by your state's Department of Motor Vehicles and allows you to operate trucks, buses, and other large vehicles for pay. The process takes weeks to months and involves a written test, a skills test, and a medical examination. You cannot skip steps or test in a different state to avoid requirements — each state has its own testing standards, though they follow federal minimums.
The timeline depends on how quickly you complete each stage. Most people take four to eight weeks from start to finish, but this varies based on how soon you can schedule your medical exam and skills test, and whether you pass on your first attempt.
Key Takeaways
- You must pass a medical examination by a certified medical examiner before you can take any CDL test, and this certificate is valid for two years.
- The written knowledge test covers general CDL rules plus endorsement-specific material (hazmat, passenger, air brake), and you study using your state's CDL manual.
- The skills test includes a pre-trip vehicle inspection, a basic control test, and a road test, all performed in a vehicle you provide or rent.
- You need a valid regular driver's license, proof of residency, and proof of citizenship or legal presence before you start the process.
- Some states allow you to take the written test before your medical exam; others require the medical exam first — check your state's order.
Get your medical certification first or early
Before you take any CDL test, you need a Medical Examiner's Certificate from a doctor on the Federal Motor Carrier Safety Administration (FMCSA) registry. This is not your regular doctor — it must be someone certified specifically for CDL medical exams. You can find certified examiners on the FMCSA website by entering your state and zip code.
The exam checks your vision, hearing, blood pressure, and ability to operate a vehicle safely. It costs between $75 and $150 depending on the examiner. The certificate is valid for two years from the date issued. Some states let you take the written test before this exam; others require it first. Check your state DMV website to see the required order.
Schedule this early because examiner availability can create delays. Once you have the certificate, keep a copy with you — you will need to show it when you take your skills test.
Study and pass the written knowledge test
Your state DMV publishes a CDL Manual (usually free online or in print at the DMV office) that covers all the material on the written test. The test has two parts: a general knowledge section that everyone takes, and endorsement-specific sections if you want to haul hazardous materials, carry passengers, or operate air-brake vehicles.
The general knowledge test is typically 50 questions, and you must score at least 80 percent to pass. Endorsement tests add 20 to 30 questions each. You can take the test at your state DMV office, and most states allow you to retake it the same day if you fail, though some have a waiting period.
Study the manual thoroughly — the test is specific about rules, distances, and procedures. Many people use practice tests available online or through CDL training schools to prepare. Budget two to four weeks of study time if you are learning the material for the first time.
Schedule and prepare for the skills test
Once you pass the written test, you can schedule your skills test, which has three parts: the pre-trip inspection, the basic control test, and the road test. All three happen on the same day, usually at a DMV testing site or an approved third-party testing location.
You must bring a vehicle that meets the requirements for the class of license you are testing for — typically a truck or bus with air brakes. If you do not own one, you can rent one from a CDL training school or a truck rental company. The vehicle must be in safe working condition and have valid registration and insurance.
The pre-trip inspection requires you to walk around the vehicle and point out safety components while explaining what you are checking. The basic control test involves backing, parking, and maneuvering in a closed course. The road test is a 20 to 30-minute drive on public roads where an examiner watches your steering, braking, lane changes, and overall safety.
What documents to bring to each test
For the medical exam, bring your state ID or passport, proof of your current address (utility bill or lease), and your regular driver's license. Bring the same documents to the written test, plus your Medical Examiner's Certificate.
For the skills test, bring your Medical Examiner's Certificate, your passing written test score (the DMV will have it on file, but bring proof), your regular driver's license, proof of residency, and proof of citizenship or legal presence (passport, birth certificate, or immigration documents). You also need the vehicle registration and proof of insurance for the truck or bus you are testing in.
Different states have slightly different document requirements, so check your state DMV website before you go. Bring originals, not copies, unless the DMV specifically says copies are acceptable.
Pass the skills test and get your CDL
You must pass all three parts of the skills test on the same day to receive your CDL. If you fail any section, you can retake the entire test, but the waiting period and retesting fee vary by state — typically $10 to $50 per retake.
Once you pass, the DMV issues your CDL, usually on the spot or within a few days. Your CDL is valid for four to eight years depending on your state. You will need to renew it before it expires, and renewal requires another medical exam.
If you want endorsements (hazmat, passenger, air brake), you take additional written tests after you have your base CDL. Some endorsements require a background check or fingerprinting, which adds time and cost.
Common reasons people fail and how to avoid them
The most common failure on the written test is not studying the manual thoroughly enough. The test is very specific — it asks about exact stopping distances, specific traffic laws, and vehicle maintenance rules. Generic driving knowledge is not enough. Use practice tests to identify weak areas and study those sections again.
On the skills test, people most often fail the pre-trip inspection because they forget to explain what they are checking or they miss a safety component. Examiners want to hear you describe the inspection step by step. Practice this part repeatedly before test day.
Road test failures usually happen because of speed control, improper lane changes, or not checking mirrors frequently enough. Examiners are watching for safe, defensive driving habits. If you are nervous, take a practice drive with an instructor first.
Frequently Asked Questions
Can I use my regular driver's license while I am getting my CDL?
No. Once you have a regular driver's license, you cannot legally operate a commercial vehicle without a CDL, even if you are still in the testing process. You must have your CDL before you drive commercially for any reason, including for work.
Do I have to go to a CDL training school, or can I test on my own?
You can test on your own without attending a formal school in most states. However, you must still pass the written and skills tests. Many people find that a CDL training school helps them prepare faster and provides access to a vehicle for the skills test. Schools typically cost $3,000 to $7,000 and take two to six weeks.
What happens if I fail the skills test?
You can retake it after a waiting period (usually one to seven days, depending on your state). You pay a retesting fee and must bring all the same documents and a vehicle again. You do not have to retake the written test unless your passing score expires (usually after one year).
Can I get a CDL in one state and move to another?
Yes, but you must transfer your CDL to your new state within a certain timeframe (usually 30 to 60 days). You will need to visit your new state's DMV, provide proof of residency, and pay a transfer fee. You do not have to retake the tests unless your new state has different requirements.
What disqualifies you from getting a CDL?
Certain medical conditions, serious traffic violations, and drug or alcohol convictions can disqualify you. The medical examiner will tell you if a health issue is a barrier. For legal disqualifications, check your state DMV website or ask at the DMV office — rules vary by state.