Combination Vehicles Practice Test | Kentucky 2026 #2

Train for FREE online with our Kentucky CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a KY combination license in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.

Number of Question 20

Passing Score 16

Number of Tests 20

1 . The trailer hand valve should not be used while you are driving because:

It will disconnect from the vehicle.

You will stop the vehicle too quickly.

It can cause a skid.

Never use the trailer hand valve while operating your vehicle. Using the trailer hand valve while driving can cause your trailer to skid.

2 . Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.

One second

Two seconds

Three seconds

At speeds below 40 mph, you should allow at least one second of following distance for every 10 feet of your vehicle. Follow the same formula when traveling at faster speeds, then add one additional second to your following distance. Remember that larger vehicles require more space to stop than smaller vehicles.

3 . To prevent a rollover, cargo should be:

Loaded with most weight on the driver’s side of the trailer.

Placed near the rear of the trailer.

Spread out in the trailer.

Cargo weight should be evenly distributed within a trailer to reduce the risk of a rollover. Do not place too much weight on one side of a trailer.

4 . During a trip, landing gear should be:

Completely raised.

Completely lowered.

Skimming the pavement.

Landing gear, or trailer supports, should always be completely raised before a vehicle is driven. Landing gear that is not entirely raised could catch on railroad tracks or other hazards on the roadway.

5 . If a trailer begins to jackknife, the driver:

Should not apply the trailer hand brake.

Should firmly apply the brakes.

Can straighten the trailer with the parking brake.

If a trailer begins to jackknife, you should release the brakes and allow the trailer wheels to regain traction with the road. Do not apply the trailer hand brake to attempt to straighten out the rig because the application of brakes is what caused the wheels to lock in the first place.

6 . All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).

1943

1998

2009

All trailers and converter dollies manufactured on or after March 1, 1998 must have Anti-Lock Braking Systems (ABS).

7 . Pushing in the trailer air supply control will:

Supply the trailer with air.

Deactivate the air brakes.

Prevent the vehicle from skidding.

Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.

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2026 Kentucky | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Kentucky, you must already possess a Commercial Driver's License (CDL). Then, you need to pass a Doubles/Triples knowledge test. However, this endorsement does not require a skills test. Once you pass the knowledge test, the endorsement will be added to your CDL. Remember, each state has its own testing procedures.

To obtain a CDL Doubles/Triples license, you must already have a Commercial Driver's License (CDL). You must then pass the Doubles/Triples knowledge test. There's no additional skills test for this endorsement. The endorsement is added to your CDL after passing the knowledge test. It's important to note that testing procedures can vary by state.

While it's beneficial to have experience or training, it's not required by law to obtain a CDL Doubles/Triples endorsement. However, you must already hold a Commercial Driver's License (CDL). The only mandatory step is to pass the Doubles/Triples knowledge test. Once you pass, the endorsement is added to your CDL. Specific procedures may vary by state.

Yes, to obtain a CDL Doubles/Triples endorsement, you are required to pass the Doubles/Triples knowledge test. This test covers information specific to driving these types of vehicles, such as handling and safety protocols. However, there is no additional skills test for this endorsement. Once you pass the knowledge test, the endorsement is added to your CDL.

Actually, there's no specific skills test or maneuvers required for the CDL Doubles/Triples endorsement. The process only involves passing a knowledge test. This test focuses on understanding safety rules and operation of these types of vehicles, including coupling and uncoupling, inspecting doubles and triples, and handling. Once you pass the test, the endorsement is added to your CDL.

No, it is not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Kentucky. Driving these types of vehicles requires specialized knowledge and skills, which are verified through the endorsement process. Violating this requirement can lead to serious penalties, including fines and suspension of your CDL.

You can append the CDL Doubles/Triples endorsement to your existing commercial driver's license (CDL). You don't need to initiate a new license application. However, you must pass the Doubles/Triples knowledge test. Once you've passed the test, the endorsement is added to your current CDL. Remember, each state has its own process and fees for adding endorsements.

Yes, there are limitations. Drivers with a CDL Doubles/Triples endorsement are allowed to drive vehicles with more than one trailer, but the total weight of the vehicle(s) must not exceed the Gross Combination Weight Rating (GCWR). Additionally, drivers must obey all state and federal regulations regarding hours of service, vehicle inspection, and maintenance.

In Kentucky, the maximum weight for a double/triple trailer combination is 80,000 pounds. The maximum length for a semi-trailer or trailer in a truck-tractor, semi-trailer, and trailer combination is 28 feet 6 inches. However, these restrictions can vary from state to state and are also subject to federal regulations. Always check local and federal laws before driving.

Yes, drivers with a CDL Doubles/Triples endorsement must follow specific safety guidelines. These include maintaining a safe following distance, not driving in high winds, regularly inspecting coupling devices and tires, and ensuring the heaviest trailer is directly behind the truck. Additionally, they must comply with all standard CDL safety regulations and hours of service rules.