Which subparts of the HMR are most relevant to hazmat shipments?

• A. Subparts 200, 201
• B. Subparts 172, 173, 177, 178, and 180
• C. Subparts 250, 251
• D. Subparts 100, 110

Answer: (B)

The most relevant parts focus on how hazmat shipments are communicated, prepared, transported, and kept compliant, because these are the elements that actually make a hazmat shipment safe and lawful. Hazardous Materials Communications sets the rules for shipping papers, emergency information, and how hazards are described so responders and handlers know what they’re dealing with. Shippers’ Responsibilities lay out what the shipper must do to properly classify, package, label, and document the shipment—foundational work that determines whether the material can be transported at all. Carriage by Public Highway covers the rules for moving hazmat by road, including vehicle requirements, placarding, routing, segregation, and driver training—these are the day-to-day transport controls that prevent incidents on the highway. Specifications for Packaging ensures that the containers themselves are designed and tested to withstand transport stresses and prevent leaks or ruptures. Continuing Requirements ties everything together with ongoing compliance, training, documentation, and enforcement aspects that keep hazmat shipments safe over time. While other subparts touch on related areas, these subparts collectively address the core workflow and safety controls for hazmat shipments.