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The hazardous materials regulations (HMR) and the Federal Motor Carrier Safety Regulations (FMCSRs) both fall under the Department of Transportation. The regulations, however, are handled separately by two agencies: the Pipeline and Hazardous Materials Safety Administration (PHMSA) and the Federal Motor Carrier Safety Administration (FMCSA), respectively.
The FMCSA enforces on-road hazardous materials regulations for interstate carriers with a USDOT (U.S. Department of Transportation) number and intrastate-only carriers transporting placarded hazardous materials. Motor carrier performance, including hazardous materials compliance, is tracked under FMCSA’s Compliance Safety Accountability (CSA) program.
The FMCSRs contain limited hazardous materials transportation requirements in Part 397. This part covers hazardous materials transportation requirements, specifically the driving, parking, and hazardous materials routing rules when transporting hazardous materials.
The requirement for an FMCSA hazardous materials safety permit (when hauling certain materials) is found in Part 385.