For the purposes of the regulation and control of traffic upon the streets in the city, there is hereby established a restricted vehicular district, and the city is hereby authorized and directed to designate immediately, and from time to time as is deemed necessary for the control of traffic, all streets and parts of streets to be included within said district, and to designate the hours and limits of time of parking within such district; and for such purpose, the city is also hereby authorized and directed to erect and place such signs within such districts as shall give notice of the various hours and times of parking within such districts. (1996 Code § 9-2-1)