Why should a driver avoid walking through or touching a spilled hazardous material, even if it appears to be just a liquid puddle?

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1. This caution applies only to solid hazardous materials, not liquids
2. The material could be more hazardous than it appears, causing injury through contact or fumes
3. Walking through a spill has no health implications regardless of the material involved or its concentration
4. It is only a concern if the material is visibly smoking

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