Capital Region First Ring Expressway

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Expressway No.100
Capital Region First Ring Expressway 수도권제1순환고속도로
Route information
Length	128.02 km (79.55 mi)
Existed	1992–present
Major junctions
Cycle end	Pangyo JC in Seongnam, Gyeonggi Province Gyeongbu Expressway
Major intersections	33
Cycle end	Pangyo JC in Seongnam, Gyeonggi Province Gyeongbu Expressway
Location
Country	South Korea
Major cities	Seongnam, Hanam, Guri, Uijeongbu, Goyang, Gimpo, Incheon, Bucheon, Siheung, Anyang
Highway system
Highway systems of South Korea Expressways National Local

The Capital Region First Ring Expressway (Formerly as Seoul Ring Expressway) (Expressway No.100) (Korean: 수도권제1순환고속도로; RR: Sudogwon Je1sunhwan Gosokdoro) is an expressway, circular beltway or ring road around Seoul, South Korea. It connects satellite cities around Seoul, Ilsan, Namyangju, Hanam, Pyeongchon, Jungdong, Bundang, Pangyo, Sanbon and Gimpo. The expressway runs 127.6 km. Seoul Ring Expressway is currently under construction to widen the expressway between Anhyeon Junction to Seongnam which is expected to be finished in 2016.

Since 2010, Gyeonggi Loop Bus connect the many Satellite town to each other through this Expressway.