Which hazard class employs a transport index to limit the quantity allowed per vehicle for transport?

The use of a transport index is a unique feature of Class 7, which pertains to radioactive materials. The transport index is a numerical value that indicates the degree of radiation hazard presented by a specific package of radioactive material. This index helps to limit the amount of radioactive material that can be transported in a single vehicle to ensure safety during transport.

Regulations stipulate specific transport index limits for vehicles to minimize exposure to radiation for both transport personnel and the public, reflecting the potential dangers associated with radiation exposure. For example, higher transport index values indicate greater potential for exposure and subsequently, stricter limits on the quantity allowed per vehicle.

In contrast, other hazard classes such as flammable liquids, oxidizers, and toxic substances have different mechanisms for determining the safety measures and limits, which do not involve a transport index for the quantity allowed per vehicle. Understanding the unique characteristics of hazardous materials, particularly those related to radioactive materials, is crucial for safe handling and transportation practices.