South Carolina CDL General Knowledge Practice Test (SC) 2

4.9 out of 5 (105 votes)
80% Passing score
20 Questions
4 Mistakes allowed
As new drivers aspiring to earn a commercial driver's license (CDL), the importance of thorough preparation cannot be overstated. To aid in this crucial phase, our website offers the second in a series of comprehensive South Carolina CDL General Knowledge Practice Tests. Tailored to meet the needs of both Class A and Class B license applicants in 2026, regardless of desired endorsements, this general knowledge test practice is a pivotal tool in your preparatory arsenal! This specific SC CDL practice test is designed to challenge and enhance your understanding of the essential knowledge required for the CDL in 2026. It consists of 20 thoughtfully crafted SC CDL test questions, covering a wide spectrum of topics critical to the profession of driving commercial vehicles. These include pre-trip vehicle inspections, basic vehicle control, nuances of shifting gears - including the skill of downshifting - navigating hills and steep downgrades, effective communication with fellow drivers, speed control, and the vital awareness of drug and alcohol regulations. Achieving a minimum score of 16 correct answers is necessary to pass, mirroring the real South Carolina DMV test's rigor. Our SC DMV practice test stands out by integrating real-life driving scenarios, making the learning experience more relatable and practical. This approach not only prepares you for the written permit test but also equips you with knowledge applicable to everyday driving situations you will encounter as a professional driver. Another significant advantage of our SC DMV general knowledge practice tests is their customizable nature. You can focus on specific areas where you feel less confident, and retake the tests as many times as necessary to improve your understanding and scores. This flexibility ensures that you can study at your own pace and according to your personal schedule. Remember, while these DMV practice tests are an invaluable resource, they are meant to complement, not replace, mandatory SC drivers ed course, or in case of the CDL, Entry-level Driver Training. Incorporating these tests into your study routine will reinforce and expand upon the knowledge gained from formal driver's education, ensuring that you are comprehensively prepared for the actual South Carolina DMV permit test in 2026!
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Sample South Carolina CDL Test Questions - General Knowledge

Question 1

What must you do when approaching a red, octagonal STOP sign?

When approaching this sign _____________.
  1. A Stop only if another vehicle is approaching
  2. B Slow down and yield without stopping
  3. C Look both ways while continuing to roll
  4. D Come to a complete stop at the required location

Correct answer: D – Come to a complete stop at the required location

South Carolina law requires a driver approaching a stop sign to stop at the marked stop line. If there is no line, the stop must be made before the crosswalk or at the nearest point with a view of approaching traffic. After stopping, the driver must yield to vehicles that are in the intersection or close enough to present an immediate hazard.

Source: S.C. Code § 56-5-2330(b) — Stop Signs and Yield Signs

Question 2

How far ahead should a commercial driver normally scan the roadway?

  1. A 8 to 10 seconds
  2. B 10 to 12 seconds
  3. C 12 to 15 seconds
  4. D 15 to 17 seconds

Correct answer: C – 12 to 15 seconds

The South Carolina CDL manual recommends looking at least 12 to 15 seconds ahead. This is about one block at lower speeds and approximately one-quarter mile at highway speeds. Continue shifting your attention between near and distant conditions rather than focusing only on the farthest point.

Source: Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.4.1, “Seeing Ahead”

Question 3

If your commercial vehicle catches fire, you should pull into a service station because firefighting equipment may be available there.

  1. A True
  2. B False

Correct answer: B – False

If a vehicle catches fire, get off the road and stop in an open area away from buildings, trees, brush, vehicles, and other items that could ignite. The South Carolina CDL manual specifically warns against pulling into a service station. Notify emergency services and provide your location.

Source: Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.20.4, “Extinguishing the Fire”

Question 4

Which statement describes proper downshifting for a curve?

  1. A Accelerate while selecting a lower gear
  2. B Slow and select the proper gear before entering the curve
  3. C Wait until the vehicle is halfway through the curve
  4. D Downshift only after leaving the curve

Correct answer: B – Slow and select the proper gear before entering the curve

Reduce speed and shift into the appropriate gear before entering a curve. This allows the driver to apply some power through the turn, helping the vehicle remain stable. Attempting to downshift after entering the curve can divide the driver’s attention and interfere with smooth control.

Source: Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.3.1, “Manual Transmissions”

Question 5

A hazard ahead will require you to slow down. How should you warn drivers following your large vehicle?

  1. A Tap the brake pedal lightly to flash the brake lights
  2. B Stop in the traffic lane and begin directing traffic
  3. C Brake suddenly after reaching the hazard
  4. D Swerve around the hazard without warning

Correct answer: A – Tap the brake pedal lightly to flash the brake lights

A large vehicle can prevent following drivers from seeing a hazard ahead. When you know you will need to slow, use a few light taps on the brake pedal to flash the brake lights and provide advance warning. Four-way emergency flashers are generally used when the vehicle is moving very slowly or is stopped.

Source: Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.5.1, “Signal Your Intentions”

Question 6

What should you do immediately when a tire fails while you are driving?

  1. A Grip the steering wheel firmly with both hands
  2. B Apply the brakes sharply
  3. C Turn quickly toward the shoulder
  4. D Shift into neutral and release the steering wheel

Correct answer: A – Grip the steering wheel firmly with both hands

Hold the steering wheel firmly with both hands to keep the vehicle under control. Avoid braking unless a collision is imminent because braking after a tire failure can cause a loss of control. Once the vehicle has slowed, brake gently, pull off the road, stop, and inspect the tires.

Source: Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.17.4, “Tire Failure”

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