South Carolina CDL Practice Test: General Knowledge (SC) 6

5 out of 5 (49 votes)
80% Passing score
50 Questions
10 Mistakes allowed
Are you ready to ace your CDL General Knowledge test? Our sixth South Carolina CDL practice test is here to guide you through. With 50 well-crafted questions, this DMV practice test is a crucial step in preparing for your CDL written test. A passing mark requires correctly answering at least 40 questions. But don't worry, you can retake this CDL practice test multiple times, with the same set of questions each time, allowing you to really master the material. This SC CDL practice test encompasses a wide array of topics, essential for every aspiring commercial driver in 2026. From handling your vehicle's equipment, managing road emergencies, to procedures following an accident, and the crucial aspects of pre-trip inspections, we've got it all covered. Plus, there's a segment on hazardous materials. Even if you're not aiming for a HazMat endorsement right now, it's vital knowledge for every driver. What sets our South Carolina DMV practice test apart? It's not just a tool; it's a product of professional expertise. Crafted and meticulously reviewed by seasoned driving instructors, our sample SC CDL test questions reflect real-world scenarios. These professionals have helped thousands secure their CDLs, bringing a wealth of experience to your fingertips. Moreover, our commitment to accessibility is unwavering. Unlike many pricey alternatives, our SC DMV CDL practice test is absolutely free. Yet, it rivals any paid version in features and learning opportunities. And to top it off, we ensure our content is fresh and up-to-date, perfectly aligned with the 2026 standards. So, go ahead, take this step in your CDL preparation with confidence. Our South Carolina CDL practice test is more than just a study aid; it's a gateway to your driving success in 2026!
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Sample South Carolina CDL Test Questions - General Knowledge

Question 1

In South Carolina, what is the minimum CMV-driving disqualification for a first conviction of driving under the influence when no placarded hazardous material is being transported?

  1. A 6 months
  2. B 2 years
  3. C 1 year
  4. D 3 years

Correct answer: C – 1 year

South Carolina law requires disqualification from driving a commercial motor vehicle for at least one year after a first conviction for driving under the influence of alcohol, a controlled substance, or an impairing drug. The one-year minimum also applies to a first conviction for operating a CMV with an alcohol concentration of 0.04 or more. Transporting placarded hazardous material raises the minimum to three years.

Source: S.C. Code § 56-1-2110(A)(1), (2), (7) – Disqualification from driving commercial motor vehicle

Question 2

What should you do if your commercial vehicle begins hydroplaning?

  1. A Use stab braking immediately
  2. B Shift into a lower gear immediately
  3. C Accelerate enough to increase tire pressure on the road
  4. D Release the accelerator

Correct answer: D – Release the accelerator

Release the accelerator when the vehicle begins hydroplaning. In a manual-transmission vehicle, depress the clutch to let the wheels turn freely. Do not use the brakes to slow the vehicle while it is hydroplaning because the tires have little or no traction for steering or braking.

Source: South Carolina Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.6, “Hydroplaning”

Question 3

Which practices should a CMV driver use when backing?

  1. A Inspect the intended path before beginning
  2. B Back and turn toward the driver’s side whenever possible
  3. C Use a helper whenever one is available
  4. D All of the above

Correct answer: D – All of the above

The South Carolina CDL manual recommends checking the path, using mirrors on both sides, and backing slowly. Turn toward the driver’s side whenever possible because visibility is better from that side. Use a helper when available and agree on a stop signal before the maneuver begins.

Source: South Carolina Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.2.4, “Backing Safely”

Question 4

Even when another person loads and secures the cargo, the driver remains responsible for:

  1. A Inspecting the load and recognizing overloads or poor weight balance
  2. B Knowing the cargo is secured and does not obstruct the view ahead or to the sides
  3. C Knowing the cargo does not block access to emergency equipment
  4. D All of the above

Correct answer: D – All of the above

In South Carolina CDL guidance, the driver remains responsible for inspecting cargo, identifying overloads or poor balance, and knowing that the load is properly secured. Cargo must not obstruct the driver’s forward or side view. It also must not restrict access to emergency equipment needed during a breakdown, fire, or other emergency.

Source: South Carolina Commercial Driver’s License Manual – 2025 CDL Testing System — § 3, “Transporting Cargo Safely”

Question 5

While descending a grade in a manual-transmission CMV, which practices should be avoided?

  1. A Riding the clutch or coasting with the clutch depressed
  2. B Selecting a gear that causes the engine to rev excessively
  3. C Trying to downshift after downhill speed has already built up
  4. D All of the above

Correct answer: D – All of the above

Select a sufficiently low gear before starting down a grade. Attempting to downshift after speed increases may leave the transmission out of gear and eliminate engine braking. Riding the clutch, coasting with the clutch depressed, and selecting a gear that causes excessive engine speed also interfere with proper vehicle control.

Source: South Carolina Commercial Driver’s License Manual – 2025 CDL Testing System — § 2.16.2, “Select the Right Gear before Starting Down the Grade”, South Carolina Commercial Driver’s License Manual – 2025 CDL Testing System — §§ 13.1.11(a)–13.1.12(b), “Clutch Usage” and “Gear Usage”

Question 6

How far ahead should most good commercial drivers scan while driving?

  1. A 1 to 2 seconds
  2. B 5 to 8 seconds
  3. C 12 to 15 seconds
  4. D 18 to 21 seconds

Correct answer: C – 12 to 15 seconds

The South Carolina CDL manual recommends looking at least 12 to 15 seconds ahead, measured by the distance the vehicle will travel during that time. This is about one block at lower speeds and roughly one-quarter mile at highway speeds. Drivers should continue shifting their attention between near and distant conditions.

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

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