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South Dakota Combination Vehicles Test

Winter driving on I-90 near Wall Drug demands real combination vehicle know-how.

106

Questions

80%

To Pass

Minutes

106 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 South Dakota CDL handbook and FMCSA regulations.

About the South Dakota Combination Vehicles Test

Combination vehicles haul the goods that keep South Dakota moving – from grain and cattle to fuel and machinery. You'll often find them rolling down I-90 through the Badlands or I-29 past Sioux Falls. The state's open highways and sudden weather shifts make safe coupling, braking, and backing essential. You need to know how your trailer behaves in crosswinds on the plains.

This practice test helps you nail the Combination Vehicles section of the South Dakota CDL written exam. It covers air brakes, coupling procedures, and vehicle inspection – all based on the official South Dakota CDL manual. Each question mirrors what you'll see at the DMV.

Don't let a tricky question about glad hands or trailer air supply catch you off guard. Our test gives you instant feedback and explanations. You can retake it as many times as you like. Build your confidence before you walk into that testing center in Pierre or Rapid City.

Topics Covered

✓Coupling and uncoupling – critical for quick grain loading at elevators across the state

✓Air brakes on combination vehicles – you'll need this for I-90's long grades near the Missouri River

✓Inspecting trailer connections – loose chains or bad lights cost time at SD weigh stations

✓Pre-trip inspection for tractor-trailers – a failing step here means you don't drive

✓Handling emergency equipment – South Dakota winters demand working flares and triangles

✓Driving with doubles and triples – less common but tested for SD permit holders

Study Tips

Start with the South Dakota CDL manual's Combination Vehicles section. Focus on coupling procedures – they ask these questions often. Make flash cards for air brake components like glad hands, service lines, and tractor protection valves. Practice until you can name them without thinking.

Use our practice test to spot your weak spots. Don't just guess – read the explanations. Retake the test until you score 100% every time. That's how you'll pass the real thing on your first try.

Hit the DMV early in the morning. South Dakota test centers get busy, especially after harvest season when new drivers line up. Bring your permit, ID, and fee. You've got this.

South Dakota Specific Information

South Dakota DMV offers CDL knowledge tests at all exam stations. You'll need an appointment in Sioux Falls or Rapid City – walk-ins only work at smaller offices like Pierre or Huron. The test fee is $10 per attempt, paid at the counter.

Bring your current South Dakota driver's license, Social Security card, and proof of residency. You must pass a vision screening first. The combination vehicles test uses 20 multiple-choice questions. You need 16 correct (80%) to pass.

Tests are available in English and Spanish at most locations. If you fail, you can retake it the next business day. No limit on attempts, but each one costs $10. Study hard and save your money.

Frequently Asked Questions

What endorsement do I need to pull a trailer in South Dakota?

You need a Combination Vehicles endorsement (T) on your CDL. It's part of the Class A license test. You take a separate knowledge test for it.

How many questions are on the South Dakota combination vehicles test?

The test has 20 questions. You need to answer at least 16 correctly to pass.

Can I take the combination vehicles test in Spanish in South Dakota?

Yes. Most DMV exam stations offer the test in Spanish. Check with your local office to confirm availability.

Do I need a separate permit for double or triple trailers?

No. The combination vehicles test covers all types. But triples are rare in South Dakota – you'll mostly see single trailers.

What happens if I fail the combination vehicles test?

You can retake it the next business day. Each attempt costs $10. Use our practice test to avoid that extra fee.

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

Last verified: August 2026 · FMCSA-compliant content