It is the duty of the officers of the Police Department or any officers that are assigned by the Chief of Police to enforce all street traffic laws of this city and all the state vehicle laws applicable to street traffic in this city. Officers of the department shall make arrests for traffic violations, investigate accidents, and cooperate with other officers in the administration of the traffic laws and in developing ways and means to improve traffic conditions, and to carry out those duties specially imposed upon the department by this code and any other traffic ordinances of this city.
(`83 Code, § 15-201)