South Dakota CDL Practice Test (SD) 2026

4.9 out of 5 (77 votes)
80% Passing score
20 Questions
4 Mistakes allowed
As a South Dakotan preparing for your CDL, starting with the right resources is crucial. Our first South Dakota CDL practice test is designed to set you on a path of success in 2026! Featuring 20 multiple-choice permit test questions, this SD DMV practice test challenges and prepares you for the DMV's general knowledge test. It's essential for all, whether you're aiming for a Class A or Class B license, or seeking additional endorsements. Our SD CDL practice test encompasses a variety of topics, including pre-trip vehicle inspection, vehicle control, gear shifting techniques, navigating hills and steep downgrades, effective communication with fellow drivers, speed control, and drug and alcohol awareness. Each sample DMV test question is crafted to reflect the real CDL permit test in South Dakota, ensuring a comprehensive understanding of what's required. Accessibility is a key feature of our CDL practice tests. Access them anytime, anywhere - whether you're on a desktop at home or using a mobile device on the go. This flexibility allows you to study at your own pace, in settings that work best for you. Every question on our SD DMV CDL practice test has been meticulously written and reviewed by professional driving instructors. These experts bring years of experience and a track record of helping thousands of drivers successfully obtain their licenses. Their insight ensures that each sample DMV question is relevant, accurate, and aligns with the latest SD DMV requirements. Most importantly, our South Dakota DMV practice tests offer immediate feedback and detailed explanations for each question. This approach not only shows you the right answers but also helps you understand the reasoning behind them. This feedback is vital for learning from mistakes and solidifying your knowledge, ultimately boosting your confidence as you prepare for the actual South Dakota DMV permit test. Remember, passing this permit practice test requires a minimum score of 80%, so focus and practice are key. With our South Dakota CDL Practice Test, you're not just memorizing answers; you're gaining the knowledge and skills necessary for a successful driving career that starts in 2026!
FREE CDL Practice Test App
Pass your South Dakota CDL General Knowledge test with the NextDoorDriving app. Real questions and answers—100% free and ad-free.
Download on the App Store

Sample South Dakota CDL Test Questions - General Knowledge

Question 1

Which type of traffic sign shows route numbers, destinations, directions, distances, and nearby services?

____________ signs inform drivers of basic highway information.
  1. A Parking signs
  2. B Guide signs
  3. C Regulatory signs
  4. D Warning signs

Correct answer: B – Guide signs

Guide signs provide information that helps road users navigate. They may show route designations, destinations, directions, distances, services, points of interest, and other geographic or recreational information. Regulatory signs state traffic laws, while warning signs identify conditions that may not be readily apparent.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways, 11th ed. — § 2A.03, “Classification of Signs”

Question 2

When fighting an engine-compartment fire, you should fully open the hood before aiming the extinguisher at the fire.

  1. A True
  2. B False

Correct answer: B – False

Turn off the engine as soon as possible, but avoid opening the hood. Opening it can expose the fire to more oxygen and allow the flames to spread. The CDL manual recommends directing foam through the louvers or radiator or applying it from beneath the vehicle.

Source: South Dakota Commercial Driver License Manual — § 2.21.3, “Fire Fighting”

Question 3

Which practice can help reduce stress while operating a commercial vehicle?

  1. A Use a hand-held phone to talk with friends
  2. B Eat while driving to save time
  3. C Choose calming music and give driving your full attention
  4. D Drive faster whenever you are running late

Correct answer: C – Choose calming music and give driving your full attention

The South Dakota CDL manual recommends reducing stress before and during a trip, including listening to easy-listening music. Give driving your full attention and avoid distractions such as phone conversations or eating. Allow realistic travel time and accept delays rather than responding with aggressive or hurried driving.

Source: South Dakota Commercial Driver License Manual — § 2.10.2, “Don’t Be an Aggressive Driver”

Question 4

What is the safest general rule concerning backing a commercial vehicle?

  1. A Use the highest reverse gear to finish quickly
  2. B Avoid backing whenever a pull-forward option is available
  3. C Back toward the passenger side whenever possible
  4. D Watch only one mirror to avoid overcorrecting

Correct answer: B – Avoid backing whenever a pull-forward option is available

Avoid backing whenever possible because important areas behind a commercial vehicle may not be visible. When parking, choose a position that allows you to pull forward when leaving. If backing is necessary, inspect the path, use both mirrors, move slowly, and use a helper when available.

Source: South Dakota Commercial Driver License Manual — § 2.2.4, “Backing Safely”

Question 5

A CMV is stopped on the shoulder of a one-way or divided highway. At what distances should its three warning devices be placed toward approaching traffic?

  1. A Within 10 feet, at 100 feet, and at 200 feet
  2. B At 25 feet, 100 feet, and 250 feet
  3. C At 50 feet, 100 feet, and 300 feet
  4. D At 75 feet, 100 feet, and 400 feet

Correct answer: A – Within 10 feet, at 100 feet, and at 200 feet

Federal motor-carrier rules require devices at 100 and 200 feet toward approaching traffic, with the third device on the traffic side within 10 feet of the vehicle’s rear. The South Dakota CDL manual summarizes this as 10, 100, and 200 feet. Required devices generally must be placed as soon as possible and within ten minutes.

Source: South Dakota Commercial Driver License Manual — § 2.5.2, “Communicating Your Presence”, 49 CFR § 392.22(b)(2)(v) – Emergency signals; stopped commercial motor vehicles

Question 6

The posted limit is 55 mph, but the roadway is wet. According to CDL safety guidance, about how fast should you travel?

  1. A 35 mph
  2. B 45 mph
  3. C 55 mph
  4. D 25 mph

Correct answer: A – 35 mph

Wet pavement reduces traction and increases the distance needed to stop. CDL guidance recommends reducing speed by about one-third on a wet road. From a posted speed of 55 mph, that produces a recommended speed of approximately 35 mph, subject to further reduction when conditions require it.

Source: South Dakota Commercial Driver License Manual — § 2.6.2, “Matching Speed to the Road Surface”

More South Dakota CDL Practice Tests
Other CDL Endorsements