It shall be the duty of the traffic division with such aid as may be rendered by other members of the Police Department to enforce the street traffic regulations of the municipality and of all the state vehicle laws, to make arrests for traffic violations, to investigate accidents, and to cooperate with the Village Traffic Engineer, if one exists, and other officers of the municipality 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 said division by this code and the traffic codes of the municipality.