"National expressways" . "nationwide expressway system" . "expressways" . . "national express roads" . "Expressways in South Korea" . . . "Dangjin-Yeongdeok Expressway" . . . . "Seocheon-Gongju Expressway" . "Expressways in South Korea" . . . . . . . . . "Gwangju-Wonju Expressway" . . . . "South Korea's expressways" . . "Expressway" . . . . "Expressways" . "expressway" .