What are hazardous materials as it relates to commercial driving?

Hazardous materials in the context of commercial driving refer to substances that pose significant risks when being transported. This encompasses a range of substances that can lead to explosions, fires, or present health hazards, making option B the most accurate description.

These materials can include flammable liquids, explosives, toxic substances, corrosive materials, and reactive chemicals. The proper handling and transportation of these materials are vital due to the potential danger they pose to public safety and the environment. Regulations surrounding the transport of hazardous materials are stringent, requiring drivers to be specially trained and to follow specific guidelines to minimize risks associated with these substances.

While other options mention important characteristics of hazardous materials, they do not capture the full spectrum of risk that makes them hazardous. Some substances may indeed require special vehicles or have restrictions on transportation, but the essence of what defines hazardous materials is largely focused on the risks they present during transport.