Back to South Dakota TestsNot South Dakota? Change state

South Dakota General Knowledge Test

You'll face real questions from the same pool used at the Rapid City DMV – we built this test around them.

140
Questions
80%
To Pass
60
Minutes

140 questions · 60 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 South Dakota CDL handbook and FMCSA regulations.

About the South Dakota General Knowledge Test

If you drive a truck on South Dakota's interstates, you need a CDL. Our practice test covers exactly what the South Dakota DMV asks. You'll find questions on air brakes, cargo handling, and safe driving – all from the official handbook.

South Dakota's weather throws you curveballs. Blizzards on I-90 near Wall and high winds east of the Missouri River demand careful driving. Your test will cover winter driving, tire chains, and brake adjustments for slippery roads.

The state's agriculture and mining industries mean you'll haul heavy loads. Grain trucks, livestock trailers, and gravel rigs are common. We include load securement and weight limit questions specific to South Dakota's roads, including the I-29 grain route.

Don't study alone. Take this practice test first, then review the areas you miss. Most South Dakota drivers pass after three attempts. Start now and save yourself a trip to Pierre.

South Dakota's commercial driving is centered on I-90 (east-west) and I-29 (north-south). The state is largely rural, with long distances between cities and extreme winter conditions. Our general knowledge practice test mirrors the official South Dakota DPS CDL written exam.

I-90 across South Dakota is a long, straight corridor where fatigue and crosswinds are the primary hazards. Winter blizzards can close highways across the state, and the South Dakota Department of Transportation works to keep I-90 and I-29 open through extreme cold. The exam tests fatigue management, winter driving, and following distance in extreme conditions.

Topics Covered

✓Air brakes – critical for SD long hauls on I-90 where steep grades and cold weather test your brake system.
✓Vehicle inspection – the pre-trip inspection you'll perform at the Rapid City DMV includes points specific to SD's winter conditions.
✓Cargo securement – grain and livestock loads must meet South Dakota's tie-down rules for agricultural trucks.
✓Safe driving techniques – handling crosswinds on the open prairie and black ice on rural highways.
✓Road signs and signals – you'll see construction zone signs common on I-29 near Sioux Falls.
✓Alcohol and drug regulations – South Dakota enforces strict CDL disqualification laws for DUI.

Study Tips

Read the official South Dakota CDL handbook at least once. The DMV pulls questions directly from it. Then take our practice test – it mimics the real 50-question format. Focus on the sections you miss.

Set aside two hours. The test takes up to 60 minutes, and you need 80% to pass. Don't rush. Many SD drivers fail because they guess too fast. Review the answer explanations after each question.

Call your local DMV office before you go. The Rapid City office requires appointments for knowledge tests. In Sioux Falls you might walk in, but it's better to schedule. Bring your proof of residency and Social Security card.

South Dakota Specific Information

  • South Dakota's CDL knowledge test costs $20. You can take it at DMV offices in Pierre, Sioux Falls, Rapid City, Aberdeen, and more. Appointments are recommended – walk-ins wait longer. Check the DPS website for hours.

    You'll need two forms of ID, your Social Security card, and proof of South Dakota residency. If you're under 21, bring a parent's signature form. The test is computer-based. You'll get your score immediately.

    Fail? You can retake it the next business day. No limit on attempts, but you pay $20 each time. Don't waste money – study hard. Our practice test covers the same material.

  • The South Dakota Department of Public Safety requires a knowledge test for all CDL classes; the general knowledge exam is the foundation for every commercial license.
  • I-90 is a long, straight cross-country corridor — fatigue management and rest planning are essential.
  • Winter blizzards and extreme cold can close highways; the exam tests chain awareness and cold-weather driving.
  • Agricultural hauls of grain and livestock are heavy on rural highways during harvest season.
  • Strong crosswinds across the Great Plains can push empty trailers; the exam tests wind-steer and rollover prevention.

Frequently Asked Questions

Do I need a CDL to drive a grain truck in South Dakota?
Yes, if the truck's GVWR is over 26,000 pounds or you haul hazardous materials. Most grain trucks in SD require at least a Class B CDL. Check the handbook for exemptions.
How many questions are on the South Dakota General Knowledge CDL test?
It's 50 multiple-choice questions. You need 40 correct to pass – that's 80%. The test covers the same topics as our practice test.
Can I take the CDL knowledge test without an appointment in Sioux Falls?
You can try a walk-in, but appointments move faster. The Sioux Falls DMV gets busy. Call ahead to confirm. Better to book online at the DPS site.
What documents do I bring for the South Dakota CDL knowledge test?
Bring your valid SD driver's license, Social Security card, and two proofs of residency (like a utility bill or bank statement). Non-citizens need additional documents.
Do South Dakota CDL tests include questions about snow chains?
Yes. The handbook covers chain requirements for winter driving on SD highways. You'll see at least one question on when you must use chains. Pay attention to the weight limits.
JM

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

Last verified: August 2026 · FMCSA-compliant content