This chapter applies to: Interstate and intrastate motor carriers, including officers and employees who directly affect the safe transportation of hazardous materials, operating in Maryland and transporting hazardous materials; Those persons set forth in Transportation Article, §22-409(b), Annotated Code of Maryland; and The State, or political subdivisions of the State, transporting hazardous materials within the State, except as provided in §B of this regulation. The provisions of this chapter do not apply to law enforcement vehicles or other emergency service vehicles, such as fire and rescue vehicles, which transport hazardous materials required for the performance of their duties or services.