What type of carrier would a cargo tank truck be if it has "nitrogen/refrigerated liquid" stenciled on its side?

A cargo tank truck labeled with "nitrogen/refrigerated liquid" is classified as a cryogenic liquid carrier. This classification indicates that the vehicle is specifically designed to transport liquefied gases at very low temperatures, which include certain gases like nitrogen that can exist in a liquid state when cooled.

Cryogenic liquid carriers are built to handle substances that are kept at temperatures below -130 degrees Fahrenheit (-90 degrees Celsius), where they remain in liquid form under pressure. The design of these tanks includes insulation and materials capable of withstanding the severe cold without becoming brittle or losing structural integrity.

In summary, the correct answer reflects the specialized design and operational requirements of transporting refrigerated or cryogenic liquids, which is crucial for ensuring safety and compliance in hazardous materials handling.