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M-F 7:30am - 6pm ESTThe Department of Transportation (DOT) mandates that Hazmat Placards be used when transporting hazardous materials and dangerous goods in the United States. Identify hazardous truck and container loads, such as chemical, flammable, explosive, and poisonous materials clearly with bright truck placards and DOT placards. Our truck hazard signs come in ready-made and customizable options, including Custom Diamond Shaped Placard, Duo-Flip Placard System and Slidemaster Placard Holders, blank placards, and many other DOT HazMat placards.