Seohaean Expressway

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Expressway No.15
Seohaean Expressway 서해안고속도로
Route information
Length	346.1 km (215.1 mi)
Existed	1994–present
Major junctions
South end	Mokpo, Jeonnam Province (Mokpo IC) National Route 1
Major intersections	Namhae Expressway Muan-Gwangju Expressway Gochang-Damyang Expressway Seocheon-Gongju Expressway Dangjin-Yeongdeok Expressway Pyeongtaek-Siheung Expressway Pyeongtaek-Jecheon Expressway Yeongdong Expressway Seoul Ring Expressway Second Gyeongin Expressway
North end	Geumcheon, Seoul (Geumcheon IC) Seobu Urban Expressway
Location
Country	South Korea
Major cities	Gimje, Gunsan, Boryeong, Seosan, Dangjin, Pyeongtaek, Hwaseong, Ansan, Anyang
Highway system
Highway systems of South Korea Expressways National Local

The Seohaean Expressway (Korean: 서해안 고속도로; Seohaean Gosok Doro), meaning "West Coast Expressway", is a freeway in South Korea, connecting Mokpo to Gunsan, Dangjin, and Seoul.

It is numbered 15. The entire length from Seoul to Mokpo is 345 km and the posted speed limit is 110 km/h, enforced primarily by speed cameras. It is connected of Seohae Grand Bridge in Pyeongtaek to Dangjin.

The branch expressways of the Seohaean Expressway are Seocheon–Gongju Expressway and Pyeongtaek–Siheung Expressway.

Typical facilities of this expressway is Seohae Bridge(Korean: 서해대교; Seohae Daegyo) which the total length of 7.3 km linking the Pyeongtaek(Gyeonggi Province) and Dangjin(Chungnam Province). The bridge is the third long bridge in the Republic of Korea.

The highway is a major highway linking the Seohaean Region(서해안권) for the first north–south axis (남북 제1축), the road through the South Jeolla Province, North Jeolla Province, South Chungcheong Province, Gyeonggi Province.