Texas Combination Vehicles Test
You're not driving on flat farmland — this test covers what you need for Texas highways like I-35 through Austin, the crosswinds on I-10 west of San Antonio, and the oil field roads in the Permian Basin.
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20 questions, 80% to pass. Texas DPS tests you on coupling, trailer stability, and jackknife prevention — get ready here.
Key Topics
- •Coupling and uncoupling step-by-step
- •Jackknife prevention on slick Texas roads
- •Trailer stability in crosswinds
About the Texas Combination Vehicles Test
Topics Covered
- ✓Coupling and uncoupling procedures — Texas examiners want the exact sequence, especially for flatbed and tanker trailers common in the oil and gas industry.
- ✓Trailer stability and rollover prevention — Crosswinds on I-10 and I-20 can flip an unstable trailer; you need to know how to load and drive to avoid that.
- ✓Jackknife causes and prevention — Sudden rain on Texas highways (especially after a dry spell) creates slick conditions that trigger jackknifes if you don't react right.
- + 3 more topics
📘 Study Tips & State Info
Texas DPS examiners focus heavily on the coupling procedure. They want the exact order: inspect fifth wheel, back tractor under, check for proper lock, connect air and electrical lines, test brakes. Many questions on the test come straight from that checklist. Don't just memorize — understand why each step matters. For example, failing to lock the fifth wheel can cause a trailer to detach on I-35 at highway speed.
Another area Texas emphasizes is braking on downgrades. The manual talks about engine braking and proper gear selection. Think about I-10 coming down from the mountains near El Paso. If you ride the brakes, you'll cook them. The test will ask about when to downshift and how to avoid brake fade. Study those sections carefully.
Finally, pay attention to wind and load distribution. Texas has long stretches of open highway where crosswinds are constant. The test will ask about what to do if your trailer starts to sway. Answer: ease off the accelerator, don't brake hard, and steer gently. Memorize that order. If you can visualize driving through a dust storm on I-20, you'll remember it.
The Texas Department of Public Safety (DPS) handles all CDL testing. You can take the Combination Vehicles written test at any DPS office that offers CDL services. Most offices require an appointment — walk-ins are rarely accepted. Schedule online through the DPS appointment system. The test costs $26 for each endorsement (in addition to the $61 CLP fee).
You must bring a valid Medical Examiner's Certificate (DOT physical) when you test. Texas also requires proof of Texas residency and a Social Security number. If you're applying for a Class A CLP, you'll take the General Knowledge test and the Combination Vehicles test on the same visit. You can take them separately if needed, but most people do them together.
Texas doesn't have a time limit on the written test that's strictly enforced, but most DPS offices allow about 25 minutes. Our practice test uses the same timing. After you pass the written tests, you'll move to the skills exam — but you must hold a CLP for at least 14 days first.
About the Texas Combination Vehicles Test
The Combination Vehicles endorsement is required for every Class A CDL applicant in Texas. If you plan to drive tractor-trailers, doubles, triples, or any truck with a trailer, you need to pass this test. Texas roads aren't forgiving — you'll deal with everything from the heat of the Rio Grande Valley to the dust storms in the Panhandle, and your knowledge of coupling and trailer handling has to be solid.
This test covers coupling and uncoupling procedures, trailer stability, jackknife prevention, and the unique physics of articulated vehicles. Texas examiners pay close attention to how you handle off-tracking — because tight turns on I-35 through downtown Austin or narrow farm-to-market roads in the Hill Country demand it. You'll also need to understand how wind affects a trailer on I-10 between El Paso and Van Horn, where gusts can push a loaded flatbed sideways.
The test follows the federal standard: 20 multiple-choice questions, 80% to pass. But Texas adds its own emphasis. Expect questions about coupling on uneven ground (common in oilfield staging areas near Midland) and braking on downgrades like the ones on I-20 west of Fort Worth. The Texas CDL manual is your source — study it with Texas roads in mind.
Don't underestimate this test. Combination vehicles handle differently than straight trucks, and Texas examiners have seen every mistake. Learn the procedures cold, and you'll be ready for the skills test.
Topics Covered
Study Tips
Texas DPS examiners focus heavily on the coupling procedure. They want the exact order: inspect fifth wheel, back tractor under, check for proper lock, connect air and electrical lines, test brakes. Many questions on the test come straight from that checklist. Don't just memorize — understand why each step matters. For example, failing to lock the fifth wheel can cause a trailer to detach on I-35 at highway speed.
Another area Texas emphasizes is braking on downgrades. The manual talks about engine braking and proper gear selection. Think about I-10 coming down from the mountains near El Paso. If you ride the brakes, you'll cook them. The test will ask about when to downshift and how to avoid brake fade. Study those sections carefully.
Finally, pay attention to wind and load distribution. Texas has long stretches of open highway where crosswinds are constant. The test will ask about what to do if your trailer starts to sway. Answer: ease off the accelerator, don't brake hard, and steer gently. Memorize that order. If you can visualize driving through a dust storm on I-20, you'll remember it.
Texas Specific Information
The Texas Department of Public Safety (DPS) handles all CDL testing. You can take the Combination Vehicles written test at any DPS office that offers CDL services. Most offices require an appointment — walk-ins are rarely accepted. Schedule online through the DPS appointment system. The test costs $26 for each endorsement (in addition to the $61 CLP fee).
You must bring a valid Medical Examiner's Certificate (DOT physical) when you test. Texas also requires proof of Texas residency and a Social Security number. If you're applying for a Class A CLP, you'll take the General Knowledge test and the Combination Vehicles test on the same visit. You can take them separately if needed, but most people do them together.
Texas doesn't have a time limit on the written test that's strictly enforced, but most DPS offices allow about 25 minutes. Our practice test uses the same timing. After you pass the written tests, you'll move to the skills exam — but you must hold a CLP for at least 14 days first.