Why should a non-hazmat driver still know the basic shapes and colors used on hazardous materials placards?

Pick an answer

1. Placards are standardized only within a single state, so they vary elsewhere, though it only feels that way with placards
2. It is only useful information for law enforcement, not drivers
3. It helps them judge how much extra caution and distance to give a vehicle carrying hazardous materials
4. Placard shapes and colors only matter to inspectors, never to other drivers

Correct!

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