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Question:

Why do vehicles hauling hazardous materials need warning placards?

Answer: So emergency services know what they are dealing with in an accident

Explanation
There may be circumstances in an accident, e.g. if you are unconscious, where you will be unable to tell the emergency services what load you're carrying. That's why it's essential that your vehicle is clearly marked as carrying hazardous materials to help them assess the situation.
This question is in Section 1: General Knowledge of our CDL Test Guide. Explore now!
Related Question

Question: How can you determine if your vehicle is equipped with ABS?

1. Check for yellow ABS malfunction lamps on the instrument panel.

2. Check if your vehicle was manufactured after March 1, 1998 (they are required to have the panel light).

3. Look for wheel speed sensor wires that are coming from the rear of your brakes.

4. All of the above

All of the above

Most vehicles now will have a light on the instrument panel that will illuminate briefly when the vehicle is started to alert you about the ABS, but you can always check for wires from your brakes.

Question: If you are stopped at a roadside rest area and found to have a BAC (Blood Alcohol Concentration) of 0.02 you will:

Be placed out of service for 24 hours.

Question: You may hang up on a railroad track if:

The tracks have a steep approach.

Question: Whenever your vehicle is placarded, do not drive near open fire unless you:

Can safely pass the fire without stopping.

Question: What is a slack adjuster?

It is an adjusting nut on the the backside of the brake drum, used for adjusting the brakes.

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