A. It shall be the duty of the officers of the police department or such officers as are assigned by the chief of police to enforce all street traffic laws of the state and city.
B. Officers of the police department or such officers as are assigned by the chief of police are hereby authorized to direct all traffic by voice, hand or signal; provided that, in the event of a fire or other emergency or to expedite traffic or to safeguard pedestrians, officers of the police department may direct traffic as conditions may require.
C. Officers of the fire department, when at the scene of a fire, may direct or assist the police in directing traffic thereat or in the immediate vicinity. (1980 Code)