The city council establishes a prima facie speed limit of twenty-five miles per hour for all public roads located in a residential or business district as defined in Sections 515 and 235 of the California Vehicle Code, respectively, which are not listed or otherwise set forth in this chapter. (Ord. 509 § 2, 1993: Ord. 486 § 4 (part), 1992:  prior code § 13-11.040)