The oil car indeed has a hazardous material placard (Hazmat). It's color and class (the 3 at the bottom) indicate a flammable liquid. That category includes gasoline, diesel fuel, heating oil. The placards are mainly so emergency responders know what to do. The sub category beginning in 19 includes some nasty by-products like cleaning fluids and weed killers.
But the 3 category and red color mean basically if it starts leaking get the hell out of there.
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The oil car indeed has a hazardous material placard (Hazmat). It's color and class (the 3 at the bottom) indicate a flammable liquid. That category includes gasoline, diesel fuel, heating oil. The placards are mainly so emergency responders know what to do. The sub category beginning in 19 includes some nasty by-products like cleaning fluids and weed killers.
But the 3 category and red color mean basically if it starts leaking get the hell out of there.
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