One or more amber flashing lights may be displayed: By a tow truck while at the scene of an accident or a disabled vehicle or while towing a vehicle; and By snow removal and other highway maintenance and service equipment and escort vehicles. Highway maintenance and service equipment or vehicles owned by the State or a local jurisdiction, or operating under a contract with the State or a local jurisdiction, may display green flashing lights only in accordance with § 22–218(c)(6) of this subtitle. A tow truck may display a portable variable messaging sign only in accordance with § 22–218(c)(6) of this subtitle. 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. An amber flashing light: May only be displayed if allowed by a law enforcement agency designated by the governing body of the applicable county or municipal corporation; and Shall be extinguished at the request of a uniformed law enforcement officer. 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. 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. 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.