Japan National Route 308National Route 308 is a national highway of Japan connecting Chūō-ku, Osaka and Nara, with a total length of.Route descriptionLength: Origin: Chūō-ku, Osaka Terminus: Nara city Major cities: Higashiōsaka and IkomaIntersects withOsaka PrefectureRoute 25Route 26Route 165Route 170Nara PrefectureRoute 168Route 24