Where no special hazard exists that requires a lower speed for compliance with section 12.30.010 of this chapter, or its successor, the speed of any vehicle in excess of limits specified in this title is prima facie evidence that the speed is not reasonable or prudent and that it is unlawful:
A. Twenty Miles Per Hour:
1. Upon meeting or overtaking any school bus which has stopped on the street for the purpose of receiving or discharging any schoolchildren, provided such school bus bears upon the front and rear thereof a plainly visible sign containing the words "school bus" in letters no less than four inches (4") high which can be removed or covered when the vehicle is not in use as a school bus;
2. When passing a school building or the grounds thereof, or through a designated school crossing zone during school recess, or while children are going to or leaving school during opening or closing hours;
3. On all streets and at all places the prima facie speed limit shall be twenty (20) miles per hour, except on such other streets or places as otherwise posted or marked as directed by the city transportation engineer.(Ord. 24-22, 2022: Ord. 88-86 § 68, 1986: Ord. 35-86 § 1, 1986: prior code title 46, art. 7 § 117)