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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Kentucky doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The KY CDL doubles triples test covers the following sections of the Kentucky CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this KY CDL practice test now to prepare for the actual test!
1. If brakes fail on a long downgrade, you should:
turn off the engine as soon as you.
use an escape ramp if it is available.
set the parking brake.
pump the brake pedal 3 times.
2. You should always adjust your speed to be able to stop within:
the distance you can see ahead.
30 feet.
50 feet.
the length of your vehicle.
3. When driving double and triple trailers, drivers should:
steer gently and go slowly around corners.
allow more following distance.
look far ahead.
All of the above.
4. Most heavy-duty vehicles use:
air brakes.
hydraulic brakes.
pressure brakes.
solid brakes.
5. Doubles:
are less likely to rollover than straight trucks.
require more reaction time than straight trucks.
are easier to drive than straight trucks.
None of the above.
6. To prevent getting sleepy while driving, you should:
drive alone whenever possible.
close the vent.
keep cool by opening the window.
keep the cab warm.
7. What is the minimum tread depth for tires other than front tires?
8/32 inch
2/32 inch
4/16 inch
4/32 inch
8. How can you tell if a converter dollie has ABS?
There is a yellow lamp on the left side of the dolly.
There is an ABS plaque on the right side of the dolly.
There is an ABS system on the right side of the dolly.
There is a red lamp on the left side of the dolly.
9. When the spring brakes are on, you should:
exceed the posted speed limit.
not push the brake pedal down.
pump the brakes.
press the accelerator.
10. If there is a fire in your vehicle, do NOT:
pull into a service station.
park in an open area.
park away from buildings and other vehicles.
notify emergency services.
 
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Frequently Asked Questions

  • Teens under 18 must follow the three steps of the Graduated Licensing Program to obtain a class D driver's license. To apply for a permit, you must be 16 years old. If you are under 21, after holding your permit for 6 months and completing a minimum of practice driving hours, you are eligible for an intermediate license. After holding the intermediate license for 6 months, you are ready for the full unrestricted license.
  • If you are over 18, you can apply for a permit, and after 6 months, you will be eligible for a full-unrestricted license. 
  • If you are over 21, you only need to hold the permit for 30 days before applying for a full-unrestricted license.

You can schedule an appointment online for your DMV written test at the Kentucky State Police website. Locate the Kentucky driver licensing office nearest to you and check its operating hours and available days. 
When applying for the first time, you need to bring specific documents:
  • One proof of identity, such as a birth certificate or passport, and an additional document if you have changed your name (marriage certificate, legal name change order).
  • One proof of Social Security number, such as an SS Card.
  • One proof of residency, such as a utility bill, telephone bill, or bank statement.
  • School Compliance Verification Form (for minors).
Use this tool to generate a personalized list of documents.

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To pass the DMV written test, study the Kentucky Driver's Manual. Pay attention to road signs, parallel parking, turning, passing a vehicle, yielding the right of way, etc. Practice with our free tests or choose DMV Premium for additional resources!
Restrictions vary according to your age and license type. If you have a permit license:
  • You can drive only under the supervision of a licensed driver aged 21 or older in the front passenger seat.
  • You cannot transport more than one passenger under 20 (except for family members).
  • You cannot drive between 12:00 a.m. and 6:00 a.m., except for emergencies, school, or work activities.
  • Under 21 there is a "Zero Alcohol Tolerance" for those under 21.
If you have an intermediate license, the same driving hours, passenger, and alcohol restrictions apply, but you can drive alone during daylight hours.


The Kentucky instruction permit is valid for three years and can be renewed in person. Appointments are highly recommended because walk-in availability varies at different locations. If the permit is not renewed within one year of its expiration date, both the written and vision tests must be retaken.
If you do not pass your DMV written test in Kentucky, you can retake the test the following day. It is advisable to dedicate time to preparing adequately for the exam to enhance your chances of success.

KY CDL Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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