How is a hazardous materials warning presented?

Question

Signs are placed on the outside of vehicles and bulk packages to warn drivers and others about hazardous materials. These diamond-shaped signs are known as "placards."

Accepted Answer

On a placard

Answer

By wrapping the package in orange

Answer

By placing the item away from other cargo and covering it with a sign

Answer

With flashing lights

How is a hazardous materials warning presented?

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