What is required for labeling hazardous materials?

For hazardous materials, it is crucial that all packages display appropriate labels as defined by regulations. This requirement serves several critical purposes, including ensuring safety during transport, providing vital information to emergency responders, and helping handlers identify the nature of the material being transported. Proper labeling indicates the specific hazards associated with the materials, such as whether they are flammable, corrosive, or toxic.

In the context of the other options, placing labels on the top of packages is not a standard requirement; labels can be placed on any side of the package as long as they are visible and meet regulatory visibility requirements. Indicating segregation requirements alone may not provide enough information for safety and compliance, as comprehensive labeling must reflect all hazards. Finally, labeling is vital not just for international transport; it is a requirement for all hazardous materials transport, regardless of the destination. Thus, the necessity for accurate and appropriate labeling applies universally to ensure safety in all scenarios involving hazardous substances.