(a) The traffic engineer shall conduct studies and investigations of the public streets and highways within the city and shall determine those places on public streets and highways where a particular danger or hazard exists to motor vehicle traffic and pedestrian traffic and shall place and maintain traffic control signs, signals, and devices in accordance with these studies and determinations as required under this chapter and other traffic laws. In addition, the city manager, the director of transportation, the chief of police, the chief of fire-rescue, or personnel acting under their authority, and public contractors or their employees performing work pursuant to any federal, state, county, road district, or city contract, may place and maintain barricades, detour signs, or other warning devices at places where danger becomes apparent as a result of hazards caused by the weather or natural phenomena, defects, or obstructions in or near streets, alleys, sidewalks, parkways, parks, or other public places, as a result of building construction or demolition, or where street, alley, or sidewalk construction or repair is underway.
(b) The traffic engineer shall conduct studies and investigations of the public streets and highways within the city and, in accordance with these studies, recommend to the city council those places on public streets and highways where permanent traffic diverters should be located. After the city council approves a location, the department of transportation is authorized to install and maintain permanent traffic diverters at the approved location. (Ord. Nos. 14584; 14900; 22026; 23694; 28424; 30239; 30654)