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You've seen the diamond shaped signs on trucks and tankers but do you know what they mean?
The signs are called placards and indicate a hazard classification.
A placard is a warning sign measuring 10.8 inches on each side and standing on one point
(like a diamond), that is placed on the four vertical sides of the truck, rail car, intermodal
container or two sides of an intermediate bulk container containing hazardous materials. Placards
are required by the U.S. Department of Transportation, Transport Canada, Secretariat of Transport
(Mexico) and other regulatory agencies around the world when shipping hazardous materials by
air, highway, rail or water.
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