During my drive to Nashville, I begin to wonder what those four digit numbers on the placards on the side of trucks mean?
It would seem that when carrying unsafe materials, the companies place the placard on the truck so as to inform first-responders on how to deal with the product in case of an emergency. The first responder just looks up the code in a book, and then knows what product he is dealing with and what precautions he needs to make.
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