Dot Placard
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  Define the hazard – use DOT placards.
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Out on the highway, it makes a big difference if you're carrying a tanker full of water instead of one full of organic peroxide or explosives. The Department of Transportation's regulations require trucking, rail and sea freight companies to post placards on their flanks letting everyone know when they're carrying something volatile or hazardous. It might only make drivers a small percentage safer… but sometimes it’s the thinnest margin that matters.

As everyone in the transport industry knows, DOT placards work to keep the roads safer, but they also enable emergency responders to make the right calls in case of disaster – so everyone's just a little more secure behind the wheel. These signs are also required on some freight trains, where they use the same codes as elsewhere and perform the same function. Make sure everyone gets where they're going safely with DOT-compliant placards.
Toxic Placards
The United States has several different systems for labeling chemicals in workplaces – there’s the Globally Harmonized System, there’s HMIS, and there’s the famous NFPA diamond. But because companies around the world need to be able to identify items in transport quickly and easily, goods need a different system while they’re en route. DOT placards are made to be interpreted by transport personnel across the world, so no one will ever mishandle cargo due to ignorance.
Hazardous Placards
DOT plates aren’t necessary for small amounts of chemicals. (The acetone in nail polish remover is highly flammable, for example, but no one would ever suggest that you’d need to buy a placard if you picked up a bottle at the pharmacy!) There are two kinds of numerical placard codes – UN codes and US-specific codes – but the pictograms and labels are international. DOT placards give transport and emergency personnel essential information about hazardous materials, keeping everyone safe.
Explosive Placards  
Flammable Gas Placard
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