Which organization is NOT responsible for enforcing the DOT HMR?

The National Transportation Safety Board (NTSB) is not responsible for enforcing the Department of Transportation Hazardous Materials Regulations (HMR). Instead, the NTSB primarily focuses on investigating transportation accidents and making safety recommendations, rather than enforcing regulations related to the transportation of hazardous materials.

On the other hand, the Federal Highway Administration (FHWA), the U.S. Coast Guard, and the Federal Railroad Administration (FRA) are all involved in some capacity with the enforcement of the HMR. The FHWA oversees highway safety and the movement of hazardous materials on roads, while the Coast Guard has jurisdiction over shipping regulations and hazardous materials transported via waterways. The FRA is responsible for regulations relating to the transportation of hazardous materials by rail.

Understanding the specific roles of each agency helps clarify the enforcement landscape of hazardous materials regulations within the Department of Transportation.