(a) The common council is authorized and empowered to determine and establish upon any street or highway within the city or any part thereof, limited speed zones which speed limit shall constitute the maximum speed at which any person may drive or operate any vehicle upon zone, street or highway or portion thereof so zoned, and on which highway the maximum speed permissible in said zone has been conspicuously posted by signs adopted by the council.
(b) The beginning and end of such limited speed zones shall be indicated by signs showing the speed limits.
(c) The council may change the speed limit or extent of any such limited speed zone at any time it may deem necessary.
(d) The common council is hereby authorized in its discretion to increase the speed which shall be prima facie lawful upon certain portions of federal highways as required by federal regulations, provided that there shall be placed adequate signs giving notice of such special regulations.
(Code 1982, §§ 23-901, 23-902)