What is a characteristic of a High Pressure Tank Truck?

A High Pressure Tank Truck is specifically designed to transport gases and liquids at elevated pressures, typically above 100 psi. This design is crucial for maintaining the integrity of the contents during transport and ensuring safety. Tanks used for these purposes are built to withstand significant internal pressure, which allows for the transportation of materials that may not be safe or feasible at standard atmospheric pressure.

In contrast, the other options describe characteristics that do not align with the nature of high-pressure tank trucks. For example, high-pressure tank trucks are not limited to carrying only solids, nor are they restricted to a maximum capacity of 7000 gallons. Moreover, while some high-pressure tanks may transport corrosive liquids, this is not a defining characteristic of all high-pressure tank trucks, as their main feature focuses on the pressure threshold rather than the material type.