What is the purpose of the UN ID Number?

The UN ID Number serves the specific purpose of identifying hazardous materials and dangerous goods during transport. It is a four-digit number assigned by the United Nations that uniquely represents a specific substance or group of substances. This identification is important for ensuring that emergency responders, transporters, and other stakeholders can recognize the exact nature of the material being transported.

When placed on the orange panel of a transport vehicle, the UN ID Number helps to provide immediate information about the contents, allowing for appropriate safety measures to be taken. This system enhances communication and safety in the handling and transportation of hazardous materials across different regions and countries.

The other choices do not accurately reflect the function of the UN ID Number. The identification of the type of transport vehicle, the distinction between hazardous and non-hazardous materials, and the categorization of substances by weight are not roles fulfilled by the UN ID Number.