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The placard on a tanker carrying hazardous materials will tell you the class of the hazard (flammable, explosive, corrosive, etc). If you have access to the North American Guide or a similar reference, the placard will also tell you something a bit more specific about the identity of the hazardous material - its category, or sometimes its chemical name.
The hazard class of the substance being carried
It is a DOT hazardous materials placard indicating compressed oxygen.
Flammable placards must be posted on all sides of tanker transporting JP-8
Shipment contains a mixed load of hazardous materials
A placard identifying hazard class 6 describes the presence of a poisonous gas. For an image, see the related link, below.
Le placard (masc.) means the cupboard in English.
It seems like you're referring to endorsements. "T" is the endorsement to pull double and triple trailers. "X" is a combination of two endorsements - Hazardous materials, and tanker.
The DOT hazardous materials placard for organic peroxides may be - an all-yellow diamond shape with "ORGANIC PEROXIDE" and "5.2" lettering, or - the revised DOT placard which is red on top and yellow on the bottom, with a stylized flame in the red area.
dans mon placard means 'in my cupboard' in English.
Tanker to Tanker transfer
Hazardous materials identified in vehicles and rail cars through the use of placards.