Kentucky CDL Practice Tests & Study Guide
Welcome to the Kentucky section of CDL Prep Hub. The Kentucky CDL written exam is administered by the Kentucky Transportation Cabinet. Below you'll find a free practice test for every endorsement, a step-by-step summary of what's tested, and a direct link to the most recent official Kentucky CDL handbook PDF.
Quick facts about getting your CDL in Kentucky
- Issuing agency: Kentucky Transportation Cabinet
- Minimum age (intrastate): 18 years old. A few employer-restricted programs accept 17-year-old graduates of accredited driving schools.
- Minimum age (interstate): 21 years old, in line with FMCSA rules. Drivers 18–20 may operate interstate under the FMCSA Safe Driver Apprenticeship Pilot.
- Required tests: General Knowledge written exam, plus the written exam for any endorsement you want; Air Brakes if your test vehicle is air-brake equipped; and the three-part skills test (vehicle inspection, basic control, on-road).
- Medical card: A current DOT medical examiner's certificate is required for most CDL holders. Self-certify your driving category with the Kentucky Transportation Cabinet.
- ELDT: Federal Entry-Level Driver Training is required for first-time Class A or Class B CDL applicants and for upgrading from Class B to Class A.
Start KY General Knowledge Practice Test →
Practice tests for every endorsement
Each link below opens a fresh 25-question practice test built from our CDL question bank. Questions and answer choices are shuffled deterministically per state and endorsement so you can come back to the same test and study the same wording.
General Knowledge GK
The foundation test taken by every CDL applicant in every state.
Air Brakes L (restriction removed)
Required if your test vehicle has air brakes — otherwise an L-restriction is added.
Combination Vehicles GK (Class A)
Required for Class A: tractor-trailer driving, coupling, off-tracking and trailer brakes.
Hazardous Materials H
Required to haul placarded amounts of hazardous materials. Includes a TSA background check.
Passenger P
Required to drive a vehicle designed to carry 16+ passengers (including the driver).
School Bus S
Required to drive a school bus carrying students. Adds federal student-safety rules on top of P.
Tank Vehicle N
Required to haul liquids or gases in a tank rated 1,000+ gallons aggregate.
Doubles / Triples T
Required to pull more than one trailer behind a single tractor.
How Kentucky structures the CDL exam
In Kentucky, CDL applicants typically begin by studying the official handbook published by the Kentucky Transportation Cabinet, then visit a designated testing office to take the written knowledge exams. Once the written exams are passed, the applicant is issued a Commercial Learner's Permit (CLP), which lets them practice driving a commercial vehicle on public roads with a CDL-holding supervisor seated next to them. After holding the CLP for the federally required 14-day minimum, the applicant can sit for the three-part skills test in a vehicle representative of the class they want to drive.
Most CDL applicants in Kentucky take more than one knowledge exam at the office in a single visit — for example, General Knowledge plus Air Brakes plus Combination Vehicles is the standard combination for a Class A license. The endorsement-specific knowledge exams (Hazmat, Passenger, School Bus, Tank, Doubles/Triples) can be taken either with the initial license or added on later. Hazmat is the only endorsement that also requires a TSA security threat assessment, including fingerprinting, before it can be added to your license.
Most-missed topics on the Kentucky CDL exam
Across every state we track, the same handful of topics trip up the most applicants on the General Knowledge test: weight definitions (GVWR vs. GCWR vs. GAWR), the difference between hydroplaning and aquaplaning-related stopping distance, the rules for stopping at railroad crossings in a commercial vehicle, the proper use of the trailer hand valve in an emergency, and the signs of overheating brakes on a long downgrade. If you're studying for a Kentucky Class A license, plan to spend extra time on each of these.
For applicants going after specific endorsements, the most common gotchas are: Hazmat placarding tables and segregation rules; Passenger emergency-exit and post-trip child-check procedures; Tank baffle vs. unbaffled vs. smooth-bore differences and the surge they create; and Doubles/Triples coupling order and the proper way to test the trailer brake separately before any movement. Every endorsement page on CDL Prep Hub focuses on these high-yield areas first.
Apply, study, and earn your CDL
Want a step-by-step plan? Read How to apply for a CDL in Kentucky for the documents you need, the fee schedule, and the realistic timeline from "I'm thinking about it" to "I'm holding the license." For pay expectations, the Kentucky CDL salary guide uses the latest U.S. Bureau of Labor Statistics data for heavy and tractor-trailer truck drivers.