What is the purpose of Packaging Instructions (PI) in the DGR?

• A. To specify the exact packaging requirements—design, materials, tests, and performance standards—for each dangerous goods item
• B. To list the shipper's contact details
• C. To determine freight charges
• D. To provide emergency contact numbers

Answer: (C)

Packaging Instructions in the DGR define the exact packaging requirements for dangerous goods, including the packaging type, design, materials, tests, and performance standards that must be met to safely contain the substance during transport. They ensure the chosen packaging will withstand normal conditions and handling, specify how packaging is assembled (inner and outer packaging, closures, etc.), and align with testing criteria and compatibility with the hazard class. This focus on safe containment and compliance is why that option is the best choice. Choices about shipper contact details, emergency contact numbers, or freight charges aren’t determined by packaging instructions; those elements come from other parts of the documentation and processes.