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South Carolina General Knowledge CDL Practice Test

Free General Knowledge practice questions tailored for South Carolina CDL applicants. The questions follow FMCSA standards used by the South Carolina Department of Motor Vehicles.

Why this matters in South Carolina

South Carolina SCDMV's CDL program follows the FMCSA Federal Motor Carrier Safety Regulations Part 383. If you are pursuing the General Knowledge portion of the South Carolina CDL exam, the South Carolina Department of Motor Vehicles will use the same federal core questions you practice here, plus any state-specific items the South Carolina Department of Motor Vehicles chooses to include.

What you will learn

The General Knowledge exam is the foundation of every CDL. Every commercial driver — Class A, B, or C — must pass it before any endorsement is added. The test covers vehicle inspection, basic control, shifting, backing, communicating, distracted and aggressive driver awareness, night and adverse-condition driving, railroad-highway grade crossings, accident procedures, fires, alcohol and drug rules, hazardous materials awareness, fatigue management, and cargo securement basics.

Sample questions

• Q1. What is the most frequent cause of crashes involving commercial motor vehicles?
• Q2. A complete pre-trip inspection of a commercial vehicle should take approximately how long?
• Q3. GVWR stands for:
• Q4. When you must back a tractor-trailer, you should:
• Q5. The proper hand position on the steering wheel is:
• Q6. Controlled braking on a CDL vehicle means:
• Q7. Stab braking means:
• Q8. The basic rule for safe following distance is one second per 10 feet of vehicle length und…
• Q9. You should turn off your engine retarder when:
• Q10. You should check your mirrors approximately every:
• Q11. Hydroplaning can begin at speeds as low as:
• Q12. Black ice is most likely to form:
• Q13. The three types of skids you must recognize are:
• Q14. Total stopping distance equals:
• Q15. At 55 mph, the average reaction distance is approximately:
• Q16. Approximate total stopping distance for a fully loaded tractor-trailer at 55 mph on dry pa…
• Q17. Under federal Hours of Service rules, the maximum driving time within a 14-hour on-duty wi…
• Q18. A 30-minute break is required after how many cumulative hours of driving?
• Q19. The 34-hour restart requires:
• Q20. A CDL holder is considered to be 'driving while intoxicated' at a blood alcohol concentrat…
• Q21. A first DUI conviction in a CDL vehicle results in disqualification for:
• Q22. A second DUI conviction in a CDL results in:
• Q23. Refusing a chemical alcohol test under federal CDL rules:
• Q24. Leaving the scene of an accident in a CDL vehicle results in:
• Q25. When required to stop at a railroad crossing, you must stop within:

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South Carolina test logistics

The South Carolina Department of Motor Vehicles charges a permit fee of $2.50/year and a license fee of $25. The minimum age is 18 (intrastate) / 21 (interstate). Schedule your knowledge test through the South Carolina Department of Motor Vehicles once you can score above 90% on this site's practice bank.