Ferries operated by the department are classified and operate as passenger vessels. In a local, state, or national emergency, or at such other time as may be required to accommodate or facilitate department needs, the department may change the classification of one or more of its ferries from passenger vessel to cargo vessel to allow the carriage of a hazardous material that would not be permitted aboard a ferry classified as a passenger vessel. Before changing the classification of a ferry operating as a passenger vessel to a cargo vessel, the department will obtain the permission of the local United States Coast Guard Marine Inspection Office.