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Question:

Which of these is a serious traffic violation that will disqualify you from a commercial vehicle?

1. Excessive speeding (15 mph or more faster than posted limit)

2. Listening to your music too loudly

3. Tailgating

4. All of the above

Answer: Excessive speeding (15 mph or more faster than posted limit)

Explanation
While playing music too loudly could cause distractions and tailgating can lead to accidents, only excessive speeding is a serious traffic violation, which can disqualify you from driving a commercial vehicle. Committing two serious traffic violations within a three-year period will cause you to lose your CDL for at least 60 days. Three of more such violations in a three-year period will cause you to lose your CDL for at least 120 days.
This question is in Section 1: General Knowledge of our CDL Test Guide. Explore now!
Related Question

Question: Retarders

1. reduce wear and tear on the brakes.

2. apply braking power to the drive wheels.

3. reduce the need to apply the brakes to slow the vehicle.

4. do all of the above.

do all of the above.

Retarders, of which there are many types, apply braking power directly to the drive wheels so that you will not need to use your brakes as often.

Question: You should avoid swinging too wide to the left before turning right because

other drivers may attempt to pass you on your right hand side.

Other drivers may not realize your intentions, and if there's a big enough gap, they may try to get through on the inside, moving into your blind spot as they do so.

Question: You are checking your brakes and suspension system for a pre-trip inspection. What are you looking for?

1. Brake pads should not have oil, grease, or brake fluid on them.

2. Brake shoes must not be worn dangerously thin, missing, or broken.

3. Both of the above are correct.

Both of the above are correct.

Question: Which of the following is a necessary qualification for non-bulk packaging?

1. A max. capacity of 450 L or less, if it is used as a receptacle for liquids

2. Max. net mass less than 400 kg, or less if used as a receptacle for a solid

3. Max. water capacity less than 454 kg, or less if used as a receptacle for gases

4. All of the above

All of the above

Non-bulk packaging has specific qualifications if it is being used as a receptacle for solids, liquids, or gases. For each, there is maximum net mass for it to qualify as non-bulk: 450 L or less for liquids, 400 kg or less for solids, and 454 kg or less for gases.

Question: Except when you are loading or unloading cargo, the tank liquid discharge valve should be always:

Closed.

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