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Pulling Doubles and Triples — CDL Doubles Triples Practice Test

Pulling Doubles and TriplesQuestion 1 of 19

19 questions in this topic · 19 drawn at random this round

A speed that is safe on a curve for a straight truck or a single-trailer combination is what for a set of doubles or triples?

CDL Manual — Doubles and Triples (§7)

Questions are based on Section 7 (Doubles and Triples) of the official CDL manual (AAMVA model). The Doubles/Triples (T) endorsement is a knowledge test only — there is no separate skills test for the endorsement itself — and it is given in ENGLISH (real test); our Chinese & Spanish are study aids to help you learn the English material. The manual also directs you to study Sections 2, 5, and 6. Federal rules (FMCSA, 49 CFR 391.11) require English proficiency to drive commercially.

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This CDL Doubles Triples Pulling Doubles and Triples practice set has 19 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL Doubles Triples knowledge test to pass.

Sample questions

Three questions from the Pulling Doubles and Triples bank with the correct answer and an explanation. The practice quiz above draws 19 questions at random from the same bank.

  1. Why should you take special care when pulling two or three trailers compared with other commercial vehicles?

    • There are more things that can go wrong, and they are less stable than other commercial vehicles — Correct answer
    • They are more stable, so you can drive them faster
    • They have fewer parts to inspect than a single trailer
    • They stop more quickly than other commercial vehicles

    Explanation: There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. English term: doubles and triples (双挂车和三挂车 / dobles y triples).

    Handbook: Section 7: Doubles and Triples — Pulling Doubles/Triples

  2. To prevent trailers from rolling over, how must you drive around corners, on ramps, off ramps, and curves?

    • Steer gently and go slowly — Correct answer
    • Steer sharply and brake hard
    • Keep the same speed you would use on a straight road
    • Accelerate through the curve to stay stable

    Explanation: To prevent trailers from rolling over you must steer gently and go slowly around corners, on ramps, off ramps, and curves. English term: rollover (侧翻 / vuelco).

    Handbook: Section 7: Doubles and Triples — Prevent Trailer from Rolling Over

  3. A speed that is safe on a curve for a straight truck or a single-trailer combination is what for a set of doubles or triples?

    • It may be too fast — Correct answer
    • It is always too slow
    • It is exactly the right speed
    • It does not matter because doubles handle curves better

    Explanation: A safe speed on a curve for a straight truck or a single-trailer combination vehicle may be too fast for a set of doubles or triples. English term: safe curve speed (安全过弯车速 / velocidad segura en curva).

    Handbook: Section 7: Doubles and Triples — Prevent Trailer from Rolling Over