What defines a cargo tank?

A cargo tank is defined as a vehicle predominantly designed for containing hazardous materials. This definition is crucial because cargo tanks are built to transport liquids or materials that could pose a risk to the environment or public safety. They are constructed with specialized features that ensure the safe transportation of these substances, including reinforced materials and secure sealing mechanisms that prevent leaks or spills.

In contrast to other definitions, the other options do not accurately describe the key characteristics of a cargo tank. For instance, a type of railroad that transports liquids focuses on transportation infrastructure rather than the design of the vehicle itself. Similarly, a vehicle designed for carrying solid waste or a container used solely for flammable gases are much narrower in scope and do not encompass the broader range of hazardous materials that cargo tanks are designed to carry. This understanding is essential for those trained in safety and supervision related to hazardous materials transportation.