Name a hazardous class that uses transport indexes to determine the amount that can be loaded in a single vehicle.

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The correct response is related to the regulation of transporting hazardous materials, specifically focusing on radioactive materials. Class 7, which consists of radioactive substances, is unique in that it employs transport indexes to safely determine the maximum quantity that can be carried in a single vehicle.

Transport indexes are numerical values that indicate the potential radiation hazard of the materials being transported. These values help ensure that the amounts loaded onto vehicles do not exceed safe limits that could endanger the public or the environment. This level of specificity in transportation regulations is particularly crucial for radioactive materials due to their health risks associated with radiation exposure.

In contrast, the other classes of hazardous materials listed have different regulatory measures. For instance, while Class 3 and Class 4 materials focus on flammable properties and might have specific volume limits based on their flammability, they do not utilize transport indexes in the same manner as Class 7. Class 5 materials pertain to oxidizers and may have their own guidelines but also do not primarily rely on transport indexes like radioactive materials do. Thus, Class 7 is distinguished by the use of transport indexes as a key factor in determining safe transport quantities.

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