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Texas Doubles and Triples Test

Hauling doubles on I-10 through the Permian Basin? You'll need this endorsement.

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 Texas CDL handbook and FMCSA regulations.

About the Texas Doubles and Triples Test

Texas highways like I-35 and I-10 see plenty of double and triple trailer rigs. You'll often share the road with oil field traffic hauling long combinations across the state. That's why the Texas DMV requires a separate endorsement for doubles and triples.

Our practice test covers the same topics you'll face on the real exam. You'll answer questions about coupling procedures, braking distances, and how wind affects your rig. Texas weather can change fast — high winds near Amarillo or sudden gusts on the coastal plains. Knowing how to handle your trailers in those conditions keeps you safe.

Each question comes from the latest Texas CDL handbook. You get a detailed explanation after every answer. That way you learn the material, not just guess. We won't waste your time with fluff.

This test has 20 questions, and you need 80% to pass. That matches the real Texas CDL requirement. Ready? Dive in and see what you know.

Topics Covered

✓Coupling and uncoupling – crucial for Texas oil field pickups and drop-offs

✓Safe driving practices – handling long combinations on narrow rural roads

✓Air brake systems – essential for heavy loads on steep grades like the Hill Country

✓Speed and stopping distances – longer rigs need more space, especially on I-35

✓Wind effects – strong crosswinds on TX-114 and the Panhandle can flip you

✓Inspecting converter dollies – common failure point for Texas doubles operators

Study Tips

Focus on the Texas-specific rules in the CDL handbook. For example, Texas requires you to inspect the converter dolly every time you couple. Don't skip that step on the skills test.

Practice with our test until you score 85% or higher. Then schedule your appointment at a Texas DMV or third-party testing site. Bring your learner's permit and valid ID. The written test for doubles and triples costs $10 plus the regular CDL fee.

Texas Specific Information

You can take the Texas Doubles and Triples knowledge test at any DMV office that offers CDL services. Many drivers prefer third-party testers because they offer more appointment slots. Check the Texas DMV website for a list of certified testing locations.

Appointments are required — no walk-ins. You'll pay a $10 endorsement fee when you pass. The test itself has 20 multiple-choice questions, and you need at least 16 correct to pass. Study the handbook and our practice test to get there.

Frequently Asked Questions

Do I need a separate endorsement for doubles and triples in Texas?

Yes. Texas makes you pass a separate knowledge test to add the T endorsement to your CDL. It's not included in any other endorsement.

What's the minimum age to get the doubles/triples endorsement?

You must be at least 21 years old to operate doubles or triples in interstate commerce. For intrastate only, Texas allows 18-year-olds with a CDL.

Can I take the Texas doubles/triples test online?

No. The Texas DMV doesn't offer an online option. You can take the written test only at an approved testing location in person.

How many times can I retake the test?

There's no official limit, but Texas makes you wait at least one day between attempts. You'll pay the $10 fee each time.

Does the Texas CDL skills test include doubles and triples?

It depends. If you already have the T endorsement on your permit, the skills test will use the same combination vehicle you plan to drive. The examiner checks your coupling and uncoupling as part of the test.

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

Last verified: August 2026 · FMCSA-compliant content