[1]
For statutory provisions authorizing local authorities to raise statutory speed limits on nonstate highways, streets and roads, see Vehicle Code § 22357; for the provisions limiting downward speed zoning, see Vehicle Code § 22358.5.
A. 
It is determined upon the basis of an engineering and traffic survey that the speed permitted by state law upon designated streets is not reasonable and safe to facilitate the orderly movement of traffic and it is declared that the prima facie speed limit shall be as adopted by city council resolution.
B. 
The declared prima facie or maximum speed limit shall be effective when appropriate signs giving notice thereof are erected upon the street and shall not thereafter be revised except upon the basis of an engineering and traffic survey. The provisions of the section shall not apply in respect to any 25-mile-per-hour prima facie limit which is applicable when passing a school building or the grounds thereof.
(1937 Code § 526; Ord. 686, 1975; Ord. 695 § A, 1976; Ord. 742 § 1, 1978; Ord. 802 § 1, 1980; Ord. 819 § 1, 1981; Ord. 837 § 1, 1983; Ord. 880 § 1, 1985; Ord. 909 § 1, 1986)
The city traffic engineer is authorized to regulate the timing of traffic signals so as to permit the movement of traffic in an orderly and safe manner at speeds slightly at variance from the speeds otherwise applicable within the districts or at intersections, and shall erect appropriate signs giving notice thereof. [1937 Code § 526.3.]