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Oklahoma Combination Vehicles Test

Oklahoma's I-35 and I-40 meet in Oklahoma City — mastering combination vehicles keeps traffic moving through this busy interchange.

106
Questions
80%
To Pass
25
Minutes

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

Opens in a practice window — choose your mode inside.

JM

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

Last verified: August 2026

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

About the Oklahoma Combination Vehicles Test

Combination vehicles make up the backbone of Oklahoma’s economy. You see them hauling cattle down US-81, moving crude oil near the Permian Basin, and delivering grain along I-44. Our state’s weather — sudden thunderstorms, high winds, and winter ice — demands skilled drivers who understand how a tractor-trailer behaves.

This free practice test covers everything from air brake inspections to proper coupling techniques. We wrote every question directly from the Oklahoma CDL Handbook. You’ll face scenarios like backing a trailer at a crowded truck stop or adjusting for crosswinds on the Turner Turnpike.

Passing the Combination Vehicles test earns you the right to pull a trailer. Without it, you can’t drive big rigs in Oklahoma. The real exam at your local DPS office has 20 multiple-choice questions. You need 16 correct to pass — that’s 80%. Our practice test mirrors that format exactly.

Take this test as many times as you want. Each attempt shuffles the questions, so you learn every topic. We don’t collect your email or charge a fee. Just study, practice, and show up confident on test day.

Topics Covered

✓Air brakes – Oklahoma's rolling hills and sudden stops require flawless brake performance.
✓Coupling and uncoupling – Agricultural and oil field trailers demand a solid connection every time.
✓Pre-trip inspection – Your skills test starts here; miss a step and you’ll fail instantly.
✓Driving techniques – Backing, turning, and lane positioning matter on narrow Oklahoma rural roads.
✓Weight distribution – Overloaded or unbalanced trailers cause jackknifes on I-35.
✓Hazard awareness – Wildlife, construction zones, and severe weather are daily realities for Oklahoma drivers.

Study Tips

Start with the official Oklahoma CDL Handbook. Read the sections on air brakes and combination vehicles twice. Our practice test matches the handbook’s language, so the more you quiz yourself, the faster you recall answers during the real exam.

Visit your local DPS office early. Ask about walk-in hours for the knowledge test — many Oklahoma locations accept walk-ins. Bring your permit, social security card, and proof of Oklahoma residency. The test costs $15.50, and you can retake it once the same day if you fail.

Oklahoma Specific Information

You can take the Combination Vehicles knowledge test at any Oklahoma DPS driver license office. Major testing locations include Oklahoma City (NE 36th St), Tulsa (2121 W 21st St), and Lawton (304 SW 5th St). Most offices accept walk-ins, but call ahead to confirm — especially in smaller towns like Woodward or Ardmore.

The knowledge test fee is $15.50. If you pass, you get a CDL permit valid for 6 months. You must hold the permit for at least 14 days before taking the skills test. The skills test costs $50 and requires an appointment. Bring a properly equipped vehicle and a valid medical certificate.

Frequently Asked Questions

Do I need a CDL to haul a cattle trailer in Oklahoma?
Yes. If your combination vehicle’s gross vehicle weight rating (GVWR) exceeds 26,000 pounds and the trailer weighs over 10,000 pounds, you need a Class A CDL. The Combination Vehicles endorsement is part of the Class A test.
What endorsements do I need for hauling oil in Oklahoma?
You need a Tanker (N) endorsement if you haul liquid or gaseous materials in bulk. Many Oklahoma oilfield drivers also get the Hazardous Materials (H) endorsement. Both require additional knowledge tests.
Can I take the combination vehicles test in a single-unit truck?
No. The combination vehicles knowledge test is the same for everyone, but the skills test requires a tractor-trailer. You must drive a combination vehicle during the road test to earn the endorsement.
Does Oklahoma accept out-of-state CDL training?
It depends. Oklahoma honors CDL permits and licenses from other states. However, if you’re getting your first CDL, you must pass all Oklahoma tests. Training from another state doesn’t waive any requirements.
How long is the Oklahoma combination vehicles knowledge test?
It’s a 20-question multiple-choice test. You get 25 minutes to finish. You need 16 correct answers to pass — that’s 80%.
JM

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

Last verified: August 2026 · FMCSA-compliant content