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Kentucky Doubles and Triples Test

You'll often haul doubles along I-65 between Louisville and Nashville, so you'd better know your stuff.

Questions

80%

To Pass

Minutes

93 questions · 25 min time limit · 80% to pass

Opens in a practice window — choose your mode inside.

Reviewed by Jack Mahana, CDL Instructor (13+ years)

Last verified: August 2026

All questions sourced from the official Kentucky CDL handbook and FMCSA regulations.

About the Kentucky Doubles and Triples Test

Kentucky's trucking industry relies heavily on doubles and triples. You'll see them daily on I-75, I-64, and I-65, hauling everything from auto parts to produce. The Kentucky Transportation Cabinet requires a separate endorsement for these combos. You must know how to handle them safely.

Winter weather on the Mountain Parkway creates unique challenges. Ice and fog reduce visibility. High winds on the bridges near the Ohio River can push your trailers. You'll need to adjust your speed and following distance. Kentucky's rolling hills also test your braking skills.

The DMV written test covers coupling and uncoupling, trailer sway, and emergency procedures. You'll get 20 questions. You need 16 correct to pass. Study the Kentucky CDL Handbook carefully. Focus on the doubles and triples section.

We built this practice test to mirror the real thing. Each question comes from Kentucky's official material. Take it multiple times until you're confident. You won't find any surprises on test day.

Topics Covered

✓Coupling and uncoupling – Kentucky's many drop-and-hook facilities near Louisville and Lexington make this a must-know.

✓Trailer sway control – You'll deal with crosswinds on I-64's open stretches, so you've got to master this.

✓Braking and stopping distances – Kentucky's steep grades on I-75 demand extra stopping room.

✓Air brake systems for doubles – Your combination needs proper air pressure; KY inspection checks this.

✓Off-tracking and wide turns – Kentucky's narrow city streets in Covington and Newport require precise maneuvering.

✓Emergency procedures – Blown tires and jackknife risks are real on Kentucky's interstates.

Study Tips

Start by reading the Kentucky CDL Handbook's doubles and triples section. Highlight key numbers: max length, weight, and speed limits. Kentucky allows 65 feet for doubles and 75 feet for triples. Know these cold.

Take our practice test at least three times. Review each wrong answer. Pay attention to questions about the converter dolly – that's a common trick question. Also, learn the pre-trip inspection steps for these combos. The DMV might ask you to explain them during your skills test.

Kentucky Specific Information

You'll take the written test at a Kentucky State Police testing site. Locations include Frankfort, Lexington, Louisville, and others. You don't need an appointment for the written test – just walk in during business hours. Bring your CLP, Social Security card, and proof of Kentucky residency.

The endorsement fee is $20. You'll pay it when you apply. If you fail, you can retake the test the next day. No waiting period. Pass at an 80% score, and you get a new CDL with the Doubles and Triples endorsement. Make sure your medical card is current.

Frequently Asked Questions

Does Kentucky require a separate written test for doubles and triples?

Yes, you need to pass the Doubles and Triples endorsement written test. It's a separate 20-question test on top of your general knowledge test.

Can I take the Kentucky CDL written test at any DMV office?

No, you take it at Kentucky State Police testing sites. Not all DMV offices offer CDL testing. Check the KSP schedule online.

What's the passing score for the Kentucky Doubles and Triples test?

You need 16 out of 20 correct, or 80%. You can retake the test the next day if you don't pass.

Do I need a CDL permit before taking the Doubles and Triples endorsement test?

Yes, you must have a Kentucky Commercial Learner's Permit (CLP) first. You can't add the endorsement without it.

How much does the Doubles and Triples endorsement cost in Kentucky?

The endorsement fee is $20. You pay it when you apply for the endorsement at the testing site.

Reviewed by Jack Mahana, CDL Instructor (13+ years)

Last verified: August 2026 · FMCSA-compliant content