Maryland Transportation Section 22-218.2

      (a)      One or more amber flashing lights may be displayed:

            (1)      By a tow truck while at the scene of an accident or a disabled vehicle or while towing a vehicle; and

            (2)      By snow removal and other highway maintenance and service equipment and escort vehicles.

      (b)      (1)      Subject to paragraph (2) of this subsection, a participant in a citizens on patrol group or other community watch group may display on a vehicle while on patrol in the community one or more amber flashing lights.

            (2)      An amber flashing light:

                  (i)      May only be displayed if allowed by a law enforcement agency designated by the governing body of the applicable county or municipal corporation; and

                  (ii)      Shall be extinguished at the request of a uniformed law enforcement officer.

            (3)      The law enforcement agency may require that a sign meeting specifications set by the agency appear on the vehicle that identifies the group conducting the patrol while the amber flashing light is displayed.

      (c)      (1)      A security guard agency licensed under Title 19 of the Business Occupations and Professions Article may equip its vehicles with one or more amber flashing lights.

            (2)      A person operating a vehicle equipped with amber flashing lights under this subsection may activate the lights only while on duty on property that the agency is responsible for patrolling.