Japan National Route 30National Route 30 is a national highway connecting Okayama and Takamatsu in Japan.Route dataLength: 26.4 km Origin: Okayama Terminus: Takamatsu Major cities: TamanoHistory1952-12-04 - First Class National Highway 30 1965-04-01 - General National Highway 30Intersects withOkayama PrefectureKagawa Prefecture