Why should a driver avoid using a cell phone or other spark-producing device near a suspected fuel or vapor leak from the tank?

Pick an answer

1. This precaution applies only at night, not during the day
2. It is a concern only for tanks carrying solid cargo
3. A spark near flammable vapor could ignite it, causing a fire or explosion
4. Cell phones have no interaction with flammable vapors under any circumstance

Correct!

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