What determines the specific hazard class symbol and color shown on a placard?
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Correct!
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Correct answer to question 50 (Hazardous Materials): The hazard class of the material being transported, as set by federal regulation
Why
Placard symbols and colors are standardized by hazard class under federal rule, which is exactly why the same symbol means the same danger no matter whose truck it's on.
Updated: November 2026
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