National Route 21 (South Korea)

National Route 21 is a national highway in South Korea connects Namwon to Icheon. It established on 31 August 1971.

History

August 31, 1971: Became National Route 21 Gunsan ~ Cheonan Line by the General National Highway Route Designation Decree.
September 8, 1973: Due to alignment improvement, road zone changed from 956m section in Boryeong-ri, Jupo-myeon, Boryeong-gun to 610m, 600m section in Myeongcheon-ri, Daecheon-eup, Boryeong-gun to 736m, 650m section in Ogwan-ri, Hongseong-eup, Hongseong-gun to 480m, 300m section in Namjang-ri, Hongseong-eup, Hongseong-gun to 170m, 370m section in Sangjeong-ri ~ Baekgye-ri, Gwangcheon-eup, Hongseong-gun to 220m, 560m section in Yongam-ri, Gwangcheon-eup, Hongseong-gun to 500m
August 8, 1975: Total 2.675km section from Okdong-ri, Nampo-myeon ~ Duryong-ri, Ungcheon-myeon, Boryeong-gun opened and existing 3.12km section abolished, 660m section from Gyejeong-ri ~ Jiseok-ri, Eungbong-myeon, Yesan-gun opened and existing 830m section abolished, total 2.675km section from Seongnae-ri, Biin-myeon ~ Hwasan-ri, Jongcheon-myeon, Seocheon-gun opened and existing 3.78km section abolished
March 14, 1981: End point extended from 'Cheonan-si, Chungcheongnam-do' to 'Janghowon-eup, Icheon-gun, Gyeonggi-do'. Accordingly changed from 'Gunsan ~ Cheonan Line' to 'Gunsan ~ Janghowon Line'.
April 16, 1981: Sinchang-dong, Janghang-eup, Seocheon-gun, Chungcheongnam-do ~ Wangjang-ri, Gamgok-myeon, Eumseong-gun, Chungcheongbuk-do 95.632km section upgraded to national highway opened
May 30, 1981: Road zone changed to the extended 63km section according to the amendment of Presidential Decree No. 10247 General National Highway Route Designation Decree
September 29, 1986: Existing designated Sindae-ri ~ Yeonchun-ri, Buk-myeon, Mokcheon-myeon, Cheonwon-gun 3.65km section, Nam-dong ~ Jangjae-ri, Baebang-myeon, Asan-gun, Onyang-si 3.52km section abolished
January 31, 1987: Mojong-dong ~ Ssangyong-dong, Cheonan-si 11.34km section including Onyang Bypass Road (Mojong-dong ~ Gwongok-dong, Onyang-si) opened
May 26, 1987: Existing designated Jusan Bridge (Yaryong-ri, Jusan-myeon, Boryeong-gun), Gwangcheon-eup area (Ongam-ri ~ Sinjin-ri, Gwangcheon-eup, Hongseong-gun), Yesan-eup area (Jugyo-ri ~ Sanseong-ri, Yesan-eup, Yesan-gun), Eumnae-ri, Sinchang-myeon, Asan-gun, Baebang-myeon area (Sindong-ri ~ Gongsu-ri, Baebang-myeon, Onyang-si) sections abolished
July 21, 1987: Singye-ri ~ Yeonchun-ri, Buk-myeon, Mokcheon-myeon, Cheonwon-gun 2.88km section opened
March 25, 1988: Maon-ri, Guhang-myeon, Hongseong-gun 280m section opened and existing 310m section abolished, Namjang-ri, Hongseong-eup, Hongseong-gun 160m section opened and existing 190m section abolished, Jungnim-ri ~ Jaejeong-ri, Cheongso-myeon, Boryeong-gun 270m section opened and existing 340m section abolished, Segyo-ri, Baebang-myeon, Asan-gun 150m section opened and existing 160m section abolished
July 1, 1996: Starting point extended from 'Gunsan-si, Jeollabuk-do' to 'Jeonju-si, Jeollabuk-do'. Accordingly became 'Jeonju ~ Icheon Line'.
December 20, 1997: Yongjeong-dong, Deokjin-gu, Jeonju-si ~ Naecho-dong, Gunsan-si 45.5km section designated as automobile-only road
December 24, 1997: Daegyo-ri, Hongseong-eup, Hongseong-gun ~ Yeokap-ri, Osan-myeon, Yesan-gun 15.1km section newly opened, existing 17.2km section abolished
January 8, 1998: Gwan-ri ~ Seongnae-ri, Biin-myeon, Seocheon-gun 3.24km section newly opened, existing 2.1km section abolished
April 9, 1998: Ssangjeong-ri ~ Ingok-ri, Maengdong-myeon, Eumseong-gun 1.6km section opened, existing 1.65km section abolished
September 24, 1998: Eumnae-ri, Sinchang-myeon ~ Nam-dong, Asan-si, Chungcheongnam-do 12.7km section designated as automobile-only road
March 23, 2001: Road zone changed for Banwol-dong ~ Yongjeong-dong, Deokjin-gu, Jeonju-si 660m section due to Jeonju Interchange improvement project
May 14, 2001: Hammok-ri, Deoksan-myeon, Jincheon-gun 880m section opened, existing 920m section abolished
July 1, 2001: Naecho ~ Oksan Road (Gunjang Industrial Base Access Road, Naecho-dong ~ Dangbuk-ri, Oksan-myeon, Gunsan-si) 11.7km section expansion opening
August 25, 2001: Starting point extended from 'Jeonju-si, Jeollabuk-do' to 'Daegang-myeon, Namwon-si, Jeollabuk-do'. Accordingly became 'Namwon ~ Icheon Line'.
November 7, 2001: Daecheon-dong, Boryeong-si ~ Ongam-ri, Gwangcheon-eup, Hongseong-gun 15.45km section expansion opening, existing 16.2km section abolished
December 27, 2001: Gwanchang-ri ~ Jugyo-ri, Jugyo-myeon, Boryeong-si 2.42km section expansion opening, existing 2.3km section abolished
December 31, 2001: Oksan ~ Daeya Road (Gunjang Industrial Base Access Road, Dangbuk-ri, Oksan-myeon ~ Bokgyo-ri, Daeya-myeon, Gunsan-si, Unhoe-ri ~ Okseok-ri, Gaejeong-myeon, Gunsan-si) 9.8km section expansion opening. Daeya ~ Gongdeok, Seongdeok ~ Daeya Road 2km section simultaneously opened
May 28, 2002: Daeya ~ Gongdeok ~ Jeonju Road (Jochon-dong, Deokjin-gu, Jeonju-si ~ Jigyeong-ri, Daeya-myeon, Gunsan-si) 25.9km section expansion opening
December 9, 2002: Okdong-ri, Nampo-myeon ~ Gwanchang-ri, Jugyo-myeon, Boryeong-si 10.4km section designated as automobile-only road
July 5, 2004: Sin-ri, Sanggwan-myeon, Wanju-gun ~ Wondang-dong, Wansan-gu, Jeonju-si 8.91km section designated as automobile-only road
December 5, 2004: Gyoseong-ri ~ Sangsin-ri, Jincheon-eup, Jincheon-gun 41.km section expansion opening
December 30, 2005: Guryong-dong ~ Songsan-dong, Jeongeup-si 3.2km section expansion opening
December 31, 2005: Hwasan-dong ~ Gwanchang-ri, Jugyo-myeon, Boryeong-si 4.24km section expansion opening
August 16, 2006: Asan-si National Highway Alternative Bypass Road (Haengmok-ri, Sinchang-myeon ~ Guryeong-ri, Baebang-myeon, Asan-si) 11.9km section expansion opening
December 20, 2007: Deoksan ~ Yesan Road (Gwanjak-ri ~ Gungpyeong-ri, Yesan-eup, Yesan-gun) 3.6km section expansion opening
December 31, 2007: Hwaseong-ri, Seongnam-myeon ~ Tapwon-ri, Byeongcheon-myeon, Cheonan-si 3.17km section expansion opening, existing Sangdong-ri, Buk-myeon ~ Tapwon-ri, Byeongcheon-myeon, Cheonan-si 4.02km section abolished
July 14, 2008: Asan-si National Highway Alternative Bypass Road (Eumnae-ri ~ Haengmok-ri, Sinchang-myeon, Asan-si) 1.5km section expansion opening
December 26, 2008: Gui ~ Yongjeong Road (Sin-ri, Sanggwan-myeon, Wanju-gun ~ Samcheon-dong 3-ga, Wansan-gu, Jeonju-si) 16.7km section opened
December 31, 2008: Hongseong Southern Bypass Road (Maon-ri, Guhang-myeon ~ Jangseong-ri, Geumma-myeon, Hongseong-gun) 5.8km section newly opened, existing 6.4km section passing through Hongseong town center abolished
December 22, 2009: Okdong-ri, Nampo-myeon ~ Hwasan-dong, Boryeong-si 7.09km section expansion opening, existing Okdong-ri, Nampo-myeon ~ Gwanchang-ri, Jugyo-myeon, Boryeong-si 10.2km section abolished
November 22, 2010: Eumnae-ri, Sinchang-myeon, Asan-si 600m section expansion opening
December 31, 2010: Due to Asan-si National Highway Alternative Bypass Road opening, existing Eumnae-ri, Sinchang-myeon ~ Guryeong-ri, Baebang-eup, Asan-si 11.5km section abolished
March 28, 2011: Yongjeong-dong, Deokjin-gu, Jeonju-si ~ Yongheung-ri, Yongjin-myeon, Wanju-gun 11.23km section designated as automobile-only road
November 28, 2012: Jincheon IC ~ Geumwang Road Section 1 (Sangsin-ri, Jincheon-eup, Jincheon-gun ~ Masan-ri, Maengdong-myeon, Eumseong-gun) 11.02km section expansion opening, existing Sangsin-ri, Jincheon-eup, Jincheon-gun ~ Bonseong-ri, Maengdong-myeon, Eumseong-gun 9.6km section abolished
December 28, 2012: Jincheon IC ~ Geumwang Road Section 2 (Masan-ri, Maengdong-myeon ~ Gakhoe-ri, Geumwang-eup, Eumseong-gun) 9.9km section expansion opening, existing Bonseong-ri, Maengdong-myeon ~ Byeongam-ri, Saenggeuk-myeon, Eumseong-gun 11.762km section abolished
December 19, 2013: Guryeong-ri, Baebang-eup, Asan-si ~ Sinbang-dong, Dongnam-gu, Cheonan-si 7.0km section expansion opening, existing Gongsu-ri ~ Buksu-ri, Baebang-eup, Asan-si 1.5km section abolished
February 13, 2015: Yongjeong Intersection ~ Banwol Intersection among Yongjeong ~ Yongjin Road (Yongjeong-dong ~ Goryang-dong, Deokjin-gu, Jeonju-si) 3.2km section expansion opening
December 28, 2015: Naewol-ri, Jeokseong-myeon ~ Gumi-ri, Donggye-myeon, Sunchang-gun 2.7km section expansion opening, existing 2.0km section abolished
October 28, 2016: Banwol Intersection ~ Yongjin Intersection among Yongjeong ~ Yongjin Road (Goryang-dong, Deokjin-gu, Jeonju-si ~ Yongheung-ri, Yongjin-eup, Wanju-gun) 8.0km section expansion opening
October 28, 2016: Banwol Intersection ~ Yongjin Intersection among Yongjeong ~ Yongjin Road (Goryang-dong, Deokjin-gu, Jeonju-si ~ Yongheung-ri, Yongjin-eup, Wanju-gun) 8.0km section opening postponed to November
November 10, 2016: Banwol Intersection ~ Yongjin Intersection among Yongjeong ~ Yongjin Road (Goryang-dong, Deokjin-gu, Jeonju-si ~ Yongheung-ri, Yongjin-eup, Wanju-gun) 8.0km section expansion opening
December 30, 2016: Expanded and opened a 3.91 km section of the YongduÃ¢ÂÂDongmyeon road (Tapwon-ri, Byeongcheon-myeon, Dongnam-gu, Cheonan-si ~ Hwage-ri, Dong-myeon), closing the existing 3.63 km section.
December 31, 2017: Expanded and opened Section 1 of the SeocheonÃ¢ÂÂBoryeong road (Oseok-ri, Seocheon-eup, Seocheon-gun ~ Singu-ri, Jusang-myeon, Boryeong-si), 15.1 km, and closed the existing 6.223 km section. Also expanded and opened Section 3 of the SeocheonÃ¢ÂÂBoryeong road (Duryong-ri, Ungcheon-eup, Boryeong-si ~ Okdong-ri, Nampo-myeon), 13.14 km, closing the previous section (Duryong-ri, Ungcheon-eup ~ Eumnae-ri, Nampo-myeon) totaling 5.01 km.
December 26, 2018: Expanded and opened the Jeongeup BujeonÃ¢ÂÂSunchang Ssangchi road (Shinseong-ri, Ssangchi-myeon, Sunchang-gun ~ Bujeon-dong, Jeongeup-si), 7.36 km, and closed a total of 7.47 km: Jonggok-ri ~ Bangsan-ri section (1.95 km) in Ssangchi-myeon, Sunchang-gun, and 5.52 km in Bujeon-dong, Jeongeup-si.
December 31, 2019: Expanded and opened the Sunchang Ssangchi-jinae road (Geumpyung-ri ~ Shinseong-ri, Ssangchi-myeon, Sunchang-gun), 6.44 km, and closed the previous 760 m section (Geumpyung-ri ~ Oksan-ri, Ssangchi-myeon).
December 30, 2020: Expanded and opened the Sunchang DonggyeÃ¢ÂÂJeokseong road (Gumi-ri ~ Gwanjeon-ri, Donggye-myeon, Sunchang-gun), 3.98 km.