True or False: Containers are required by the US Department of Transportation to have pressure relief valves or fusible plugs.

The statement is true because the US Department of Transportation (DOT) regulations require that certain containers, especially those used for transporting hazardous materials, have safety features like pressure relief valves or fusible plugs. These features are essential for preventing dangerous pressure build-up within the containers during transit, which could occur due to temperature changes or other external factors. Pressure relief valves allow gases to escape safely without risking an explosion or rupture of the container, while fusible plugs will melt at specific temperatures, releasing pressure in the event of a fire. This safety requirement aims to protect both the environment and public safety during the transportation of materials that could pose a risk if not properly secured.