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Question:

Which of these is optional, but should always be used when available?

1. A helper

2. Rearview cameras

3. Your mirrors

4. Your warning flashers

Answer: A helper

Explanation
A human helper is very desirable when backing up. They can see all the blindspots you can’t. They can also keep other people out of the way. Make sure you agree on a clear and simple system of hand signals before beginning.
This question is in Section 1: General Knowledge of our CDL Test Guide. Explore now!
Related Question

Question: How many red reflective triangles must you carry with you for emergencies?

3

In your safety equipment, you must include three reflective red triangles, or six fusees, or three liquid burning flares. You are not exempt if your truck is shorter, as long as it is a commercial vehicle, and you may be required to have extra safety devices for longer loads.

Question: A placarded vehicle must carry a fire extinguisher with a minimum rating of

10-B:C

All placarded vehicles are required to have a fire extinguisher rated by UL as able to extinguish a 10-square-foot class B fire (which includes almost all flammable liquids) and as electrically nonconductive (hence its C rating).

Question: It is not safe to drive a vehicle that has brake drums (or discs) with cracks or that are thinner than the manufacturer's specifications. Typically, this will be

1/2 inch.

Question: What is the sliding mechanism and locking device for tandem axles on trailers?

Tandem release (arm / locking pin)

Question: What should you make sure is secure and not leaking and its cap(s) are tight?

Fuel tank(s)

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