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The DOT hazard classification system can be used to identify acute hazards.
explosives
The number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
COLOR
The radioactive placard on a vehicle indicates that the vehicle carries some amount or regulated radioactive material.
color of label or placard
Uranium hexafluoride is in Transportation Hazard Class 7 (radioactive) with a Subsidiary Risk in Class 8 (corrosive).
color of the label or placard
A placard identifying hazard class 6 describes the presence of a poisonous gas. For an image, see the related link, below.
The hazard class of the substance being carried
symbol, UN hazard class number, color, UN identification number
It is a DOT hazmat placard meaning "compressed oxygen."