UN numbers are used to identify what in international transport?

UN numbers are used to identify what in international transport?

• A. People on board
• B. Weather conditions
• C. Airport runways
• D. Dangerous goods and hazardous substances

Answer: (D)

UN numbers identify dangerous goods and hazardous substances in international transport. Each four-digit code links to a specific material and its hazard class, providing a universal reference that works across air, sea, road, and rail shipments. This system ties the number to the proper shipping name and tells handlers what kind of risk is involved, guiding packaging, labeling, segregation, quantity limits, and emergency response procedures. In practice, the UN number helps everyone—from shippers to pilots or captains and first responders—quickly understand what is being carried and how to handle it safely. They have no relation to people on board, weather conditions, or airport runways.

UN numbers identify dangerous goods and hazardous substances in international transport. Each four-digit code links to a specific material and its hazard class, providing a universal reference that works across air, sea, road, and rail shipments. This system ties the number to the proper shipping name and tells handlers what kind of risk is involved, guiding packaging, labeling, segregation, quantity limits, and emergency response procedures. In practice, the UN number helps everyone—from shippers to pilots or captains and first responders—quickly understand what is being carried and how to handle it safely. They have no relation to people on board, weather conditions, or airport runways.