Hazardous material signs: what you need to know

Using HAZMAT placards to identify a shipment

Class numbers 

UN/NA numbers

Compatibility letters

Colors, words and graphics

Questions you may have about hazmat placards and freight 

Is it safe to drive near a truck carrying hazmat freight?

Which hazmat class is the most dangerous?

Why are there multiple placards on a truck?

Can carriers transport multiple types of dangerous goods in one truck?

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