Oklahoma Doubles and Triples Test
You're not just hauling freight — you're fighting crosswinds on I-40 and keeping your doubles straight through the Arbuckle Mountains.
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20 questions, 80% to pass. Oklahoma-specific content on coupling, wind, and mountain grades. Start practicing now.
Key Topics
- •Coupling and uncoupling sequence
- •Trailer sway and wind control
- •Air brake checks for multiple trailers
About the Oklahoma Doubles and Triples Test
Topics Covered
- ✓Coupling and uncoupling procedures — Oklahoma examiners want the exact sequence, especially when you're hooking on uneven ground at a grain elevator in Enid.
- ✓Trailer stability and rollover prevention — critical on I-35 through the Arbuckles where curves tighten and wind shifts fast.
- ✓Jackknife causes and prevention — a jackknife on I-40 during an ice storm can shut down the whole corridor; know how to avoid it.
- + 3 more topics
📘 Study Tips & State Info
Oklahoma DPS examiners focus hard on coupling procedures. Don't just memorize the steps — understand why you do each one. They'll ask about the order of connecting air lines vs. electrical lines, and they want you to know what happens if you forget to close the emergency glad hand. Practice the sequence out loud while you're sitting in your truck.
Another thing: Oklahoma's wind is no joke. The manual talks about reducing speed in high wind, but examiners want you to know specific numbers — like when to drop to 40 mph on I-40 between Elk City and Sayre. They also drill into brake timing for triples. On a downhill grade on the Turner Turnpike, a half-second delay in brake application can cause a whipsaw. Know your brake lag.
Finally, don't skip the inspection section. Oklahoma requires a full pre-trip for doubles/triples, and the written test will ask about checking for cracked glad hands, proper light connections, and secure fifth wheel locking. If you can't describe the inspection steps, you're not ready.
The Oklahoma Department of Public Safety (DPS) handles all CDL testing. You'll take the Doubles and Triples written test at any DPS exam station that offers CDL services — major locations include Oklahoma City (NE 36th St), Tulsa (Memorial Dr), Lawton, and Enid. Appointments are strongly recommended; walk-ins can wait hours. You'll need your Oklahoma CDL learner's permit and a valid Medical Examiner's Certificate before you can test.
Fees: The Doubles and Triples endorsement costs $5 on top of your standard CDL license fee. If you're adding it to an existing CDL, you'll pay the endorsement fee plus a $25 duplicate license fee. No separate skills test is required for the endorsement — just the written knowledge test. But if you fail, you must wait at least one day before retesting. DPS allows retakes the same day only at the examiner's discretion, so don't count on it.
One Oklahoma-specific rule: if you're hauling doubles or triples on the Turner Turnpike or H.E. Bailey Turnpike, you must obey the posted speed limits for combination vehicles (usually 5-10 mph lower than cars). The DPS test includes questions about these reduced speed zones. Also, Oklahoma prohibits triples on certain highways — know which ones before you hit the road.
About the Oklahoma Doubles and Triples Test
Oklahoma's not flat everywhere. If you're pulling doubles or triples through the Arbuckle Mountains on I-35 or fighting the gusty crosswinds on I-40 west of Oklahoma City, you know this test matters. The Oklahoma Doubles and Triples endorsement is required if you plan to pull more than one trailer behind your Class A rig. It covers everything from coupling sequences to trailer sway — and we've built this practice test to match what the DPS examiners actually ask.
The test has 20 multiple-choice questions. You need 16 correct to pass — that's 80%. Same as the federal standard. But Oklahoma adds its own flavor: expect questions about securing multiple trailers on inclines (think the Turner Turnpike grades) and handling wind gusts that can push a set of doubles into the next lane. Our practice test pulls from the official Oklahoma CDL manual so you see the exact scenarios you'll face at the DMV.
We've been helping Oklahoma drivers pass since 2015. Every question includes an explanation that ties back to Oklahoma road conditions — not generic textbook answers. You'll learn why off-tracking matters more on tight two-lane roads in the Panhandle, and why your coupling check needs to be second nature when you're hooking up in a busy truck stop off I-44.
Topics Covered
Study Tips
Oklahoma DPS examiners focus hard on coupling procedures. Don't just memorize the steps — understand why you do each one. They'll ask about the order of connecting air lines vs. electrical lines, and they want you to know what happens if you forget to close the emergency glad hand. Practice the sequence out loud while you're sitting in your truck.
Another thing: Oklahoma's wind is no joke. The manual talks about reducing speed in high wind, but examiners want you to know specific numbers — like when to drop to 40 mph on I-40 between Elk City and Sayre. They also drill into brake timing for triples. On a downhill grade on the Turner Turnpike, a half-second delay in brake application can cause a whipsaw. Know your brake lag.
Finally, don't skip the inspection section. Oklahoma requires a full pre-trip for doubles/triples, and the written test will ask about checking for cracked glad hands, proper light connections, and secure fifth wheel locking. If you can't describe the inspection steps, you're not ready.
Oklahoma Specific Information
The Oklahoma Department of Public Safety (DPS) handles all CDL testing. You'll take the Doubles and Triples written test at any DPS exam station that offers CDL services — major locations include Oklahoma City (NE 36th St), Tulsa (Memorial Dr), Lawton, and Enid. Appointments are strongly recommended; walk-ins can wait hours. You'll need your Oklahoma CDL learner's permit and a valid Medical Examiner's Certificate before you can test.
Fees: The Doubles and Triples endorsement costs $5 on top of your standard CDL license fee. If you're adding it to an existing CDL, you'll pay the endorsement fee plus a $25 duplicate license fee. No separate skills test is required for the endorsement — just the written knowledge test. But if you fail, you must wait at least one day before retesting. DPS allows retakes the same day only at the examiner's discretion, so don't count on it.
One Oklahoma-specific rule: if you're hauling doubles or triples on the Turner Turnpike or H.E. Bailey Turnpike, you must obey the posted speed limits for combination vehicles (usually 5-10 mph lower than cars). The DPS test includes questions about these reduced speed zones. Also, Oklahoma prohibits triples on certain highways — know which ones before you hit the road.