Which of the following is NOT one of the four primary hazard classes for hazardous materials transportation?

The classification of hazardous materials for transportation is guided by regulations that outline specific hazard classes based on the nature of the materials. The four primary hazard classes recognized for hazardous materials transportation include:

• Flammable liquids, which are materials that can easily ignite and produce flames.

• Explosives, which are substances that can undergo a rapid chemical reaction, producing gas, heat, and often a shockwave.

• Corrosive materials, which can cause destruction of living tissue or severe corrosion of materials upon contact.

Medical waste, while it can pose risks and requires special handling and disposal methods, is not classified as a primary hazard class under the transportation guidelines. Instead, it is typically categorized under regulatory frameworks that specifically address waste management and public health considerations, rather than hazardous materials transportation. This distinction is important as it helps emergency responders and transportation professionals identify and manage materials appropriately while ensuring safety during transit.