What section of the Hazardous Materials Regulations (HMR) contains general requirements?

The section of the Hazardous Materials Regulations (HMR) that contains general requirements is 49 CFR Part 171. This part is fundamental as it establishes the basic framework for the regulation of hazardous materials transportation. It covers definitions, applicability, and general requirements that apply to all hazardous materials transportation, including the responsibilities of shippers and carriers.

Part 171 serves as the foundation for understanding additional and specific regulations found in other parts, such as labeling, packaging, and other operational requirements. Thus, its importance lies in providing the essential guidelines that govern how hazardous materials should be managed throughout the shipping process.

In contrast, other parts like 172 focus on specifics related to labeling and placarding, 173 addresses the classification and packing for hazardous materials, and 175 pertains specifically to the transportation of hazardous materials by air. Each of these sections builds on the general requirements established in Part 171, but it is this part that lays the groundwork necessary for compliance across the board in hazardous materials transport.