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Driving Combination Vehicles Safely — CDL Combination Vehicles Practice Test

Driving Combination Vehicles SafelyQuestion 1 of 30

36 questions in this topic · 30 drawn at random this round

When a vehicle goes around a corner, how do the rear wheels travel compared with the front wheels?

CDL Manual — Combination Vehicles

Questions are based on the official CDL manual (AAMVA model) used by state DMVs. The real CDL knowledge test is given in English — federal rules (FMCSA, 49 CFR 391.11) require English proficiency to drive commercially; our Chinese & Spanish are study aids. Some states also offer the written test in other languages (see the per-state table).

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This CDL Combination Vehicles Driving Combination Vehicles Safely practice set has 36 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL Combination Vehicles knowledge test to pass.

Sample questions

Three questions from the Driving Combination Vehicles Safely bank with the correct answer and an explanation. The practice quiz above draws 30 questions at random from the same bank.

  1. What two things help you prevent a rollover?

    • Keep the cargo low and drive slowly around turns — Correct answer
    • Keep the cargo high and brake hard in turns
    • Inflate the tires fully and speed up in turns
    • Load to one side and follow closely

    Explanation: To prevent a rollover, keep the cargo as close to the ground as possible AND drive slowly around turns. English term: rollover（侧翻 / volcadura）.

    Handbook: Driving Combination Vehicles — Rollover Risks

  2. More than half of truck driver deaths in crashes are the result of what?

    • Truck rollovers — Correct answer
    • Tire blowouts
    • Brake fires
    • Engine failures

    Explanation: More than half of truck driver deaths in crashes are the result of truck rollovers — that is why preventing rollover is so important. English term: rollover（侧翻 / volcadura）.

    Handbook: Driving Combination Vehicles — Rollover Risks

  3. When more cargo is piled up in a truck, what happens to the center of gravity?

    • It moves higher up from the road, making the truck easier to roll over — Correct answer
    • It moves lower, making the truck more stable
    • It stays in exactly the same place
    • It shifts to the front axle only

    Explanation: Piling cargo higher moves the center of gravity higher up from the road, which makes the truck easier to turn over. English term: center of gravity（重心 / centro de gravedad）.

    Handbook: Driving Combination Vehicles — Rollover Risks