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Question:

A placarded vehicle must carry what type of fire extinguisher?

A One with a minimum rating of 10 B:C
Explaination

All placarded vehicles are required to have a fire extinguisher certified by the Underwriters Laboratory (often written as UL) to put out a minimum 10 square feet of a class B fire, which includes almost all flammable liquids and is non-conducive due to its C rating.