Answer :

If there are diamond-shaped signs on the back of a commercial truck, these are called HAZMAT posters and provide information about the type of cargo the truck is transporting.

The signs are called NFPA panels. NFPA stands for National Fire Protection Association. The idea behind these signs is to give advance notice of what firefighters are going to do when they arrive at the scene of a fire.

There are many names: articulated commercial truck trailer, tractor-trailer, 18-wheeler, rig, big rig, but what they all have in common is a GVWR of over 26,000 lbs. Heavy trucks, as the name suggests, are trucks that carry heavy loads.

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