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I see the terms PHMSA and FMCSA and know they are both part of the Department of Transportation. What is the difference?

Question:

I see the terms PHMSA and FMCSA and know they are both part of the Department of Transportation. What is the difference?

Answer:

The Pipeline and Hazardous Materials Safety Administration (PHMSA) develops the hazardous materials regulations for the various transportation modes. The Federal Motor Carrier Safety Administration (FMCSA) enforces those regulations.