Back to Missouri TestsNot Missouri? Change state

Missouri Doubles and Triples Test

You'll face I-70's long grades and tight ramps near St. Louis—our test preps you for the real setups Missouri drivers use every day.

93
Questions
80%
To Pass
25
Minutes

93 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 Missouri CDL handbook and FMCSA regulations.

About the Missouri Doubles and Triples Test

Missouri's highways carry a lot of freight, and you'll see doubles and triples rolling through the Show-Me State every day. From the flat stretches of I-44 to the rolling hills of I-55, knowing how to handle multiple trailers isn't just a test skill—it's a job requirement. Our practice test focuses on the specific setups you'll actually use here, not just generic textbook scenarios.

You'll find doubles and triples hauling grain from Missouri's farms to the Mississippi River terminals. You'll also see them on I-70 crossing the state, where fog and sudden rain can change your stopping distance in seconds. That's why we cover coupling, air brake checks, and off-tracking with local roads in mind.

Missouri's weather adds another layer. Winter ice on the I-35 corridor or summer heat on I-44 can affect trailer sway and tire pressure. Our questions push you to think about these real conditions. You don't get a do-over on the road, so you need to get it right here first.

Take this test at your own pace. Each question comes from the official Missouri CDL manual. You'll see the same language and the same emphasis on safety that the DMV expects. Pass this, and you'll walk into the exam station with real confidence.

Topics Covered

✓Coupling and uncoupling – you'll do this often at Missouri's grain elevators and distribution centers around Kansas City.
✓Air brake systems for doubles/triples – Missouri's stop-and-go traffic on I-270 demands perfect brake timing.
✓Off-tracking and turning – tight ramps near the Poplar Street Bridge in St. Louis require extra clearance.
✓Weight distribution and balance – hauling grain or steel across the Ozarks? You'll know how to keep axles within limits.
✓Speed and following distance – fog on I-44 near Rolla can reduce visibility fast, so you need real stopping distances.
✓Inspecting converter dollies – Missouri Highway Patrol checks these during roadside inspections, so get comfortable with every part.

Study Tips

Missouri's DMV won't let you take the Doubles or Triples endorsement test without a valid CDL permit. Don't forget to bring your current medical card—they check it every time. You also need to know that Missouri doesn't allow triples on all highways. Stick to the routes marked in the handbook; our test covers those restrictions.

Focus on the air brake section. Missouri's exam emphasizes brake timing, especially for triples. Practice with our questions until you can recite the brake check steps without thinking. It's not just about passing—it's about keeping your load straight on I-44's curves. Also, watch for questions about converter dolly parking brakes. They trip up plenty of drivers, but you won't be one of them after you study here.

Missouri Specific Information

You can take the Doubles and Triples endorsement test at any Missouri State Highway Patrol exam station. Appointments are required—walk-ins rarely work. Schedule online through the Missouri Department of Revenue's portal. The fee is $10 per endorsement, paid at the time of testing. Bring your current CDL permit, medical card, and a valid ID. You'll take the test on a computer, but you also do a pre-trip inspection for the endorsement skills test.

Missouri's exam stations are scattered across the state. Major ones include Jefferson City, Kansas City, Springfield, St. Louis, and Sikeston. Each station has its own schedule, so check ahead. If you fail, you can retest the same day if time permits, but you'll pay the $10 fee again. No mercy—but our practice test gives you a real shot at passing the first time.

Frequently Asked Questions

Do I need a separate endorsement for triples in Missouri?
Yes. Missouri issues a separate Triples endorsement (T). You need the Doubles endorsement (T or D) first? Actually, the code is T for both? The handbook says you need the Doubles/Triples endorsement, and it's one test. But if you only want doubles, you can take the Doubles-only test. Triples requires the full endorsement.
Can I take the Doubles and Triples test online in Missouri?
No. Missouri does not offer online CDL endorsement tests. You must go to a Highway Patrol exam station. Our practice test is for preparation only—it doesn't replace the official exam.
How many questions are on the Missouri Doubles/Triples test?
The official test has 20 questions. You need 16 correct to pass (80%). That's exactly what our practice test gives you—20 questions pulled from the same manual.
Does Missouri allow triples on all interstates?
No. Triples are only allowed on specific highways. Check the Missouri CDL handbook for the map. You'll see them on I-44, I-70, and I-55 in certain sections, but never in construction zones or restricted bridges.
What happens if I fail the Doubles/Triples test in Missouri?
You can retest the same day if you talk to the examiner. You'll pay the $10 fee again. No waiting period, but you only get two attempts per day. Study our test first so you don't waste your fee.
JM

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

Last verified: August 2026 · FMCSA-compliant content