Correct Answer: A
The U.S. Department of Transportation (DOT), through the Pipeline and Hazardous Materials Safety Administration (PHMSA), regulates the transportation of hazardous materials (HAZMAT) in commerce. CLT 4.0 emphasizes that all individuals involved in preparing, loading, transporting, or receiving hazardous goods must comply with DOT standards for classification, labeling, packaging, and documentation. These regulations ensure materials posing risks to health, safety, and property are properly contained and communicated throughout the supply chain. DOT's HMR (Hazardous Materials Regulations, 49 CFR Parts 171-180) set out training, packaging standards, and placarding systems used on all transport vehicles. While other agencies oversee workplace safety or environmental issues, DOT specifically governs transportation safety across all modes-truck, rail, air, and vessel.