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Safe Driving Rules — CDL Tank Vehicles Practice Test

Safe Driving RulesQuestion 1 of 13

13 questions in this topic · 13 drawn at random this round

On a tank trailer, what may happen if your drive wheels or trailer wheels begin to skid?

CDL Manual — Tank Vehicles (§8)

Questions are based on Section 8 (Tank Vehicles) of the official CDL manual (AAMVA model). The Tank Vehicles (N) endorsement is a knowledge test only and is given in ENGLISH (real test); our Chinese & Spanish are study aids to help you learn the English material. The N endorsement is required to haul a liquid or gas in a permanent/temporary tank over 119 gallons (or a portable tank of 1,000 gal+). Federal rules (FMCSA, 49 CFR 391.11) require English proficiency to drive commercially.

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This CDL Tank Vehicles Safe Driving Rules practice set has 13 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL Tank Vehicles knowledge test to pass.

Sample questions

Three questions from the Safe Driving Rules bank with the correct answer and an explanation. The practice quiz above draws 13 questions at random from the same bank.

  1. To drive a tank vehicle safely, which safe driving rules must you follow?

    • All of the safe driving rules — Correct answer
    • Only the rules about braking
    • Only the rules that apply on the highway
    • Only the rules for fully loaded tanks

    Explanation: In order to drive tank vehicles safely, you must remember to follow all the safe driving rules — not just a select few. The rules in this section (drive smoothly, control surge, slow for curves, allow stopping distance, recover from skids) are added safeguards on top of the normal rules. English term: safe driving rules（安全驾驶规则 / reglas de manejo seguro）.

    Handbook: Tank Vehicles — Safe Driving Rules

  2. Because of a tank vehicle's high center of gravity and liquid surge, how should you start, slow down, stop, and change lanes?

    • Very smoothly, with smooth turns and lane changes — Correct answer
    • As quickly as possible to save time
    • With sharp, sudden steering and braking
    • It does not matter, since the tank controls itself

    Explanation: Because of the high center of gravity and the surge of the liquid, you must start, slow down, and stop very smoothly, and also make smooth turns and lane changes. Sudden moves invite surge and rollover. English terms: center of gravity（重心 / centro de gravedad）, surge（液体涌动 / oleaje）.

    Handbook: Tank Vehicles — Drive Smoothly

  3. When coming to a stop in a tank vehicle, how should you apply the brakes?

    • Keep steady pressure and do not release the brakes too soon — Correct answer
    • Pump the brakes on and off all the way to the stop
    • Release the brakes early so the truck rolls to a stop
    • Use only the parking brake to stop

    Explanation: Keep a steady pressure on the brakes, and do not release the brakes too soon when coming to a stop. Releasing early lets the liquid surge forward and push the vehicle. English term: brake（刹车 / freno）.

    Handbook: Tank Vehicles — Controlling Surge (Braking)