(2) The municipal officers or a municipal official designated by the municipal officers, with the approval of the fire chief, may authorize an active member of a municipal or volunteer fire department to use one red or combination red and white flashing auxiliary light mounted as near as practicable above the front registration plate on the front of the vehicle, behind the rearview mirror in the windshield or on the dashboard at the front of the vehicle or 2 flashing red or combination red and white auxiliary lights mounted on the front of the vehicle above the front bumper and below the hood and one red auxiliary light mounted in the rear window area. The light or lights may be displayed but may be used only while the member is en route to or at the scene of a fire or other emergency. A light mounted on the dashboard or behind the rearview mirror in the windshield must be shielded so that the emitted light does not interfere with the operator's vision. The use of lights may be revoked at any time by the fire chief.