What is a key factor in determining the level of risk associated with a hazardous material?

The type and quantity of hazardous material being transported are critical in assessing the level of risk associated with it. Different materials have varying properties, such as toxicity, flammability, and reactivity, which significantly influence the potential hazards they pose in the event of an accident or spill. Additionally, the quantity can exacerbate the risk; larger amounts can lead to more severe consequences if something goes wrong.

Understanding these factors allows for appropriate risk mitigation strategies, such as selecting safer routes, using specialized containers, and preparing emergency response plans tailored to the specific characteristics of the hazardous materials involved. While other factors like geographic area and driver training may contribute to risk assessments, they do not directly define the intrinsic hazards of the materials themselves, making the type and quantity of the material central to risk determination.