SEC. 89.18. MANNER OF DIRECTION OF TRAFFIC.

   Police officers, guards and special officers are authorized to direct all traffic by voice, hand or signal in conformance with traffic laws provided that, in the event of a fire or other emergency, they may direct traffic as conditions may require notwithstanding the provisions of this division.

SEC. 89.19. OBEDIENCE TO OFFICERS.

   No person shall willfully fail or refuse to comply with any lawful order, direction or signal of a police officer, guard or special officer.

SEC. 89.20. APPLICATION TO PUBLIC EMPLOYEES.

   The provisions of this division shall apply to the driver of any vehicle owned by or used in the service of the United States Government, this state, or any county or city.