The U.S. Department of Transportation (DOT) is responsible for developing and issuing the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-185). These regulations govern the transportation of hazardous materials (hazmat) in interstate, intrastate, and foreign commerce. DOT carries out this responsibility through the Pipeline and Hazardous Materials Safety Administration (PHMSA). The primary goal of the HMR is to ensure the safety of the public...