How to Get a Commercial Driver's License in Kentucky

What you need to know before you start

A Commercial Driver's License (CDL) in Kentucky is issued by the Kentucky Transportation Cabinet and lets you operate trucks, buses, and other large vehicles for pay. You cannot get a CDL without first holding a valid regular Kentucky driver's license. The process involves written tests, a skills test, and a medical examination — and you must pass all three before the Cabinet issues your CDL.

Kentucky has different CDL classes depending on the vehicle weight and cargo type. Most people pursuing a CDL start with Class A (tractor-trailers and doubles) or Class B (single large trucks). You will also need to pass tests for any endorsements your job requires — hazmat, passenger, tanker, or doubles/triples, for example.

Key Takeaways

You must hold a valid Kentucky driver's license before you can test for a CDL, and you cannot hold both a regular license and a CDL at the same time.
The written knowledge test, the skills test, and the medical examination (DOT physical) are all separate requirements, and you must pass all three.
Kentucky requires you to pass a written test for each endorsement you need, such as hazmat or passenger transport.
You can take the written tests at any Kentucky Transportation Cabinet office, but the skills test must be scheduled at a certified testing location.
Most people complete the process in two to four weeks if they study beforehand and schedule tests promptly.

Getting your medical clearance first

Before you schedule any written or skills test, you need a Department of Transportation (DOT) medical certificate. This is a form signed by a licensed medical examiner — not your regular doctor, but a doctor certified by the Federal Motor Carrier Safety Administration (FMCSA). The exam checks your vision, hearing, blood pressure, and general health to confirm you can safely operate a large vehicle.

You can find FMCSA-certified examiners through the FMCSA National Registry at fmcsa.dot.gov. Search by your Kentucky county or city. The exam costs between $75 and $150 depending on the examiner. Once you pass, the examiner gives you a medical certificate valid for two years (or one year if you have certain health conditions). You must bring this certificate when you take your CDL skills test.

If you fail the medical exam, you can retest with a different examiner or address the health issue and try again. The Cabinet will not let you schedule a skills test without proof of a current medical certificate.

Passing the written knowledge tests

Kentucky requires you to pass a written test on general CDL knowledge, plus a separate test for your vehicle class (A or B), plus a test for each endorsement you need. You take all written tests at a Kentucky Transportation Cabinet office — there are locations in most counties. You can schedule a test appointment online through the Cabinet's website or by calling your local office.

The general knowledge test covers vehicle inspection, safe driving practices, and hazard recognition. The class-specific test covers the rules for your vehicle type. If you need hazmat, passenger, tanker, or doubles endorsements, you take a separate written test for each one. Each test is multiple choice, and you must score at least 80 percent to pass.

You can take the tests in any order, but most people take the general knowledge test first. If you fail a test, you can retake it the same day or schedule another appointment. There is no waiting period between attempts in Kentucky.

Scheduling and passing the skills test

Once you have passed all your written tests and have your DOT medical certificate, you schedule the skills test — also called the driving test or road test. This is a hands-on exam where you demonstrate that you can safely operate the vehicle. Kentucky uses third-party testing sites, which are private companies certified by the state to administer CDL skills tests.

You must bring your medical certificate, your written test passing scores, and a vehicle that matches your CDL class. Many people use a truck provided by a trucking school or company. The test has three parts: a pre-trip inspection (you walk around the truck and point out safety features), a basic control skills test (you maneuver the truck in a closed course), and a road test (you drive on public roads with an examiner).

You can find certified third-party testing sites through the Kentucky Transportation Cabinet website. Call ahead to schedule, as slots fill up quickly. The test costs between $100 and $200 depending on the site. If you fail any part, you can retake the entire test after a waiting period — Kentucky typically requires you to wait at least one day before retesting.

What happens after you pass all tests

Once you pass the skills test, the third-party testing site sends your results to the Kentucky Transportation Cabinet. The Cabinet then issues your CDL, which arrives by mail within one to two weeks. Your CDL will show your class (A or B) and any endorsements you passed tests for.

Your CDL is valid for four years in Kentucky. Before it expires, you must renew it by passing a new medical exam and a new written knowledge test — you do not have to retake the skills test unless you let your CDL lapse for more than a year or you are convicted of certain traffic violations.

Preparing for the written tests

The Kentucky Transportation Cabinet publishes a free CDL manual that covers all the knowledge test topics. You can read it from the Cabinet's website or pick up a printed copy at any Cabinet office. The manual is the best study resource because the written tests are based directly on it.

Many people also use online practice tests, which let you take sample exams similar to the real test. These are helpful for identifying weak areas, but they are not required. If you are pursuing an endorsement like hazmat, the Cabinet manual includes a section on that endorsement's rules and requirements.

Most people study for two to four weeks before taking the written tests. If you are new to trucking, allow more time. If you already work in the industry, you may need less.

Understanding CDL classes and endorsements

Kentucky issues three CDL classes. Class A covers combination vehicles (tractor-trailers) with a gross vehicle weight rating (GVWR) over 26,001 pounds and a towed vehicle over 10,000 pounds. Class B covers single vehicles over 26,001 pounds GVWR. Class C is for smaller vehicles that require endorsements like passenger or hazmat.

Endorsements are add-ons that let you transport specific cargo or passengers. Hazmat (H) lets you haul hazardous materials. Passenger (P) lets you operate buses or vans carrying 16 or more people. Tanker (N) lets you haul liquids in tank vehicles. Doubles/Triples (T) lets you pull double or triple trailers. You take a separate written test for each endorsement you need.

Frequently Asked Questions

Can I get a CDL if I have a regular Kentucky driver's license suspension or revocation?

No. You must have a valid, unrestricted regular Kentucky driver's license to hold a CDL. If your license is suspended or revoked, you cannot get a CDL until the suspension or revocation is lifted and your license is restored.

Do I have to go to trucking school to get a CDL?

No, trucking school is not required by Kentucky law. However, many employers prefer or require it, and a school can help you prepare for the written and skills tests. Some schools also provide a vehicle for your skills test, which is helpful if you do not have access to one.

What if I fail the skills test?

You can retake the skills test after waiting at least one day. You do not have to retake the written tests — your passing scores remain valid. You will need to pay the testing fee again and bring your medical certificate and vehicle.

How long does a Kentucky CDL stay valid?

A CDL is valid for four years from the issue date. You must renew it before it expires by passing a new medical exam and a new written knowledge test. If your CDL expires, you must retake the skills test to get a new one.

Can I add an endorsement to my existing CDL?

Yes. You can take the written test for any endorsement at a Kentucky Transportation Cabinet office and add it to your current CDL without retaking the skills test. You do not need a new medical certificate unless your current one has expired.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.