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{{Short description|Road in South Korea}}
{{Unreferenced|date=September 2022}}
{{Infobox road
|country=KOR
|type=EX
|route=15
|alternate_name=Seohaean Expressway 서해안고속도로
|map=15 Seohaean.svg
|length_mi=
|length_km=346.1
|length_round=
|length_ref=
|established=1994
|replaces=
|direction_a=South
|terminus_a=[[Mokpo]], [[South Jeolla Province|Jeonnam Province]] ([[Mokpo Interchange|Mokpo IC]]) [[image:Korea National Route No.1.svg|20px]] [[National Route 1 (South Korea)|National Route 1]]
|cities= [[Gimje]], [[Gunsan]], [[Boryeong]], [[Seosan]], [[Dangjin]], [[Pyeongtaek]], [[Hwaseong City|Hwaseong]], [[Ansan]], [[Anyang]]
|junction=[[File:Korea Expressway No.10.svg|20px]] [[Namhae Expressway]] [[File:Korea Expressway No.12.svg|20px]] [[Muan-Gwangju Expressway]] [[File:Korea Expressway No.253.svg|20px]] [[Gochang-Damyang Expressway]] [[File:Korea Expressway No.151.svg|20px]] [[Seocheon-Gongju Expressway]] [[File:Korea Expressway No.30.svg|20px]] [[Dangjin-Yeongdeok Expressway]] [[File:Korea Expressway No.153.svg|20px]] [[Pyeongtaek-Siheung Expressway]] [[File:Korea Expressway No.40.svg|20px]] [[Pyeongtaek-Jecheon Expressway]] [[File:Korea Expressway No.50.svg|20px]] [[Yeongdong Expressway]] [[File:Korea Expressway No.100.svg|20px]] [[Seoul Ring Expressway]] [[File:Korea Expressway No.110.svg|20px]] [[Second Gyeongin Expressway]]
|direction_b=North
|terminus_b=[[Geumcheon District|Geumcheon]], [[Seoul]] ([[Geumcheon Interchange|Geumcheon IC]]) [[image:Korea National Route No.1.svg|20px]] [[Seobu Urban Expressway]]
}}

{{Infobox Korean name
|hangul=서해안고속도로
|hanja={{linktext|西|海|岸|高|速|道|路}}
|rr=Seohaean Gosok Doro
|mr=Sŏhaean Kosok Toro
}}

[[File:SeohaeGrandBridge.jpg|thumb|300px|[[Seohae Bridge]]]]
[[File:OceanParkResort.jpg|thumb|300px|Haengdamdo Service Area]]

The '''Seohaean Expressway''' ([[Korean language|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 Bridge|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 language|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]].

== History ==
* December 1991 – Construction begin
* May 1993 – Construction begin of [[Seohae Bridge|Seohae Grand Bridge]]
* 6 July 1994 – Seoul–[[Ansan]] segment opened to traffic.
* 17 December 1996 – Ansan–[[Pyeongtaek]] segment opened to traffic.
* 25 August 1998 – Mokpo–[[Muan]] segment opened to traffic.
* 30 October 1998 – Gunsan–[[Seocheon]] segment opened to traffic.
* 10 November 2000 – Seohae Grand Bridge segment opened to traffic. and Pyeongtaek–[[Dangjin]] segment opened to traffic.
* 27 September 2001 – Dangjin–Seocheon segment opened to traffic.
* 21 December 2001 – The last segment, Gunsan–Muan segment opened to traffic.
* 30 July 2010 – Work begins to widen to 8 lanes in Ansan–Iljik Junction.
* 23 November 2011 – Jungnim Junction opened to traffic.
* October 2014 – [[Seohae Bridge]] – W. Pyeongtaek Junction Section (10.3 km) road expansion started construction.
* November 2014 – The 10-lane expansion of the Ansan JCT – Jonam JCT (2.9 km) section was completed.
* June 2015 – The 10-lane expansion of the Jonam JCT – Mokgam IC (3.2 km) section was completed.
* 23 December 2015 – The 10-lane expansion of the Mokgam IC – Iljik JCT (3.8 km) section was completed.
* 3 July 2016 – Soha Junction opened to traffic.

== Compositions ==

=== Lanes ===
* Mokpo IC – Dangjin JC, Iljik JC-West Seoul End: 4
* Dangjin JC – Bibong IC, Maesong IC-Ansan JC, Jonam JC–Mokgam IC: 6
* Mokgam IC – Iljik JC, Bibong IC – Maesong IC, West Seoul TG-Jonam JC: 8
* Ansan-Iljik, Yangjae-Giheung, unjung Bridge and Seoul Ring Road (Rigid Pavement) 130 km JC – : 10

=== Length ===
346.1 km (215.1 mi)

===Speed limits===
* Jungnim JC – Maesong IC : 110 km/h
* Maesong IC – Seoul(Geumcheon) : 100 km/h
* Mokpo – Jungnim JC : 90 km/h

==List of facilities==
{{RJL|date=November 2021}}
*'''IC''': Interchange, '''JC''': Junction, '''SA''': Service area, '''TG''':Tollgate

{| class="wikitable" style="font-size: 85%; text-align: center;"
|- style="border-bottom:solid 0.25em green;"
! No. !! Name !! Korean name !! Hanja name !! Connections !! colspan="2" | Distance !! Notes !! colspan="2" | Location
|-
! colspan="10" | Connected directly with [[Korea National Route 1|National Route 1]], [[File:Korea National Route No.2.svg|20px]] [[South Korea National Route 2|National Route 2]]([[Goha-daero]])(고하대로)
|-
!
|| Mokpo || 목포 시점 || 木浦始點 || [[Korea National Route 1|National Route 1]] [[File:Korea National Route No.2.svg|20px]] [[South Korea National Route 2|National Route 2]] [[Mokpo Bridge]] [[Aphae Bridge]] || – || 0.0 || || rowspan="2" | [[Mokpo]] || rowspan="12" | [[South Jeolla Province|Jeonnam]]
|-
! 1
|| [[Mokpo Interchange|Mokpo IC]] || 목포나들목 || 木浦나들목 || [[National Route 1 (South Korea)|National Route 1]] (Yeongsan-ro) || 0.26 || 0.26 ||
|-
!
|| [[Jungnim Junction|Jungnim JC]] || 죽림분기점 || 竹林分岐點 || [[File:Korea Expressway No.10.svg|20px]] [[Namhae Expressway]] (Mokpo–Gwangyang) [[File:Korea National Route No.2.svg|20px]] [[National Route 2 (South Korea)|National Route 2]] Jeonnam Provincial Office [[Mokpo Airport]] || 3.90 || 4.16 || || rowspan="4" | [[Muan]]
|-
! 2
|| [[Illo Interchange|Illo IC]] || 일로나들목 || 一老나들목 || [[Local Route 815 (South Korea)|Local Route 815]] || 2.10 || 6.26 ||
|-
! TG
|| [[Mokpo Tollgate|Mokpo TG]] || 목포요금소 || 木浦料金所 || || || || Main Tollgate
|-
! 3
|| [[Muan Interchange|Muan IC]] || 무안나들목 || 務安나들목 || [[National Route 1 (South Korea)|National Route 1]] || 17.28 || 23.54 ||
|-
! 4
|| [[Hampyeong Junction|Hampyeong JC]] || 함평분기점 || 咸平分岐點 || [[File:Korea Expressway No.12.svg|20px]] [[Muan-Gwangju Expressway]] [[Muan International Airport]] || 2.46 || 26.00 || || rowspan="4" | [[Hampyeong]]
|-
! SA
|| Hampyeong -cheonji SA || 함평천지휴게소 || 咸平天地休憩所 || || || || Mokpo-bound only
|-
! 5
|| [[Hampyeong Interchange|Hampyeong IC]] || 함평나들목 || 咸平나들목 || [[File:Korea National Route No.23.svg|20px]] [[National Route 23 (South Korea)|National Route 23]] || 7.81 || 33.81 ||
|-
! SA
|| Hampyeong -cheonji SA || 함평천지휴게소 || 咸平天地休憩所 || || || || Seoul-bound only
|-
! 5-1 SA
|| Bulgapsan Yeonggwang SA || 부안고려청자휴게소 || || || || || Muan-bound only (temporary rest area, no gas station) [[Hi-pass]] exclusive interchange || rowspan="2" | [[Yeonggwang]]
|-
! 6
|| [[Yeonggwang Interchange|Yeonggwang IC]] || 영광나들목 || 靈光나들목 || [[File:Korea National Route No.23.svg|20px]] [[National Route 23 (South Korea)|National Route 23]] || 24.33 || 58.14 ||
|-
! 7
|| [[Gochang Junction|Gochang JC]] || 고창분기점 || 高敞分岐點 || [[File:Korea Expressway No.253.svg|20px]] [[Gochang-Damyang Expressway]] || 16.06 || 74.20 || || rowspan="4" | [[Gochang]] || rowspan="11" | [[North Jeolla Province|Jeonbuk]]
|-
! 8
|| [[Gochang Interchange|Gochang IC]] || 고창나들목 || 高敞나들목 || [[Local Route 15 (South Korea)|Local Route 15]] || 2.74 || 76.94 ||
|-
! SA
|| Gochang Goindol SA || 고창고인돌휴게소 || 高敞고인돌休憩所 || || || ||
|-
! 9
|| [[Seonunsan Interchange|Seonunsan IC]] || 선운산나들목 || 禪雲山나들목 || [[File:Korea National Route No.22.svg|20px]] [[National Route 22 (South Korea)|National Route 22]] [[Seonunsa]] || 7.91 || 84.85 ||
|-
! 10
|| [[Julpo Interchange|Julpo IC]] || 줄포나들목 || 茁浦나들목 || [[Local Route 710 (South Korea)|Local Route 710]] || 9.87 || 94.72 || || rowspan="2" | [[Buan County|Buan]]
|-
! 11
|| [[Buan Interchange|Buan IC]] || 부안나들목 || 扶安나들목 || [[File:Korea National Route No.30.svg|20px]] [[National Route 30 (South Korea)|National Route 30]] || 16.18 || 110.90 ||
|-
! 12
|| [[West Gimje Interchange|W Gimje IC]] || 서김제나들목 || 西金堤나들목 || [[File:Korea National Route No.29.svg|20px]] [[National Route 29 (South Korea)|National Route 29]] ''[[File:Korea Expressway No.20.svg|20px]] [[Iksan-Pohang Expressway|Saemangeum-Jeonju Expressway]]'' (December 2021) [[Saemangeum]] || 13.93 || 124.83 || || [[Gimje]]
|-
! 13
|| [[East Gunsan Interchange|E Gunsan IC]] || 동군산나들목 || 東群山나들목 || [[File:Korea National Route No.21.svg|20px]] [[Korea National Route 21|National Route 21]] [[File:Korea National Route No.26.svg|20px]] [[National Route 26 (South Korea)|National Route 26]] [[File:Korea National Route No.29.svg|20px]] [[National Route 29 (South Korea)|National Route 29]] || 12.55 || 137.38 || || rowspan="4" | [[Gunsan]]
|-
! SA
|| Gunsan SA || 군산휴게소 || 群山休憩所 || || || || Mokpo-bound only
|-
! 14
|| [[Gunsan Interchange|Gunsan IC]] || 군산나들목 || 群山나들목 || [[File:Korea National Route No.21.svg|20px]] [[National Route 21 (South Korea)|National Route 21]] || 8.40 || 145.78 ||
|-
! SA
|| Gunsan SA || 군산휴게소 || 群山休憩所 || || || || Seoul-bound only
|-
! 15
|| [[East Seocheon Junction|E Seocheon JC]] || 동서천분기점 || 東舒川分岐點 || [[File:Korea Expressway No.151.svg|20px]] [[Seocheon-Gongju Expressway]] || 6.23 || 152.01 || || rowspan="4" | [[Seocheon]] || rowspan="17" | [[South Chungcheong Province|Chungnam]]
|-
! 16
|| [[Seocheon Interchange|Seocheon IC]] || 서천나들목 || 舒川나들목 || [[File:Korea National Route No.4.svg|20px]] [[National Route 4 (South Korea)|National Route 4]] || 8.98 || 160.99 ||
|-
! SA
|| Seocheon SA || 서천휴게소 || 舒川休憩所 || || || ||
|-
! 17
|| [[Chunjangdae Interchange|Chunjangdae IC]] || 춘장대나들목 || 春長臺나들목 || [[File:Korea National Route No.21.svg|20px]] [[National Route 21 (South Korea)|National Route 21]] || 11.91 || 172.90 ||
|-
! 18
|| [[Muchangpo Interchange|Muchangpo IC]] || 무창포나들목 || 武昌浦나들목 || [[Local Route 606 (South Korea)|Local Route 606]] || 8.71 || 181.61 || || rowspan="3" | [[Boryeong]]
|-
! 19
|| [[Daecheon Interchange|Daecheon IC]] || 대천나들목 || 大川나들목 || [[File:Korea National Route No.36.svg|20px]] [[National Route 36 (South Korea)|National Route 36]] [[Daecheon Beach]] || 11.99 || 193.60 ||
|-
! SA
|| Daecheon SA || 대천휴게소 || 大川休憩所 || || || ||
|-
! 20
|| [[Gwangcheon Interchange|Gwangcheon IC]] || 광천나들목 || 廣川나들목 || [[Local Route 96 (South Korea)|Local Route 96]] || 19.72 || 213.32 || || rowspan="3" | [[Hongseong]]
|-
! SA
|| Hongseong SA || 홍성휴게소 || 洪城休憩所 || || || ||
|-
! 21
|| [[Hongseong Interchange|Hongseong IC]] || 홍성나들목 || 洪城나들목 || [[File:Korea National Route No.29.svg|20px]] [[National Route 29 (South Korea)|National Route 29]] || 10.80 || 224.12 ||
|-
! 22
|| [[Haemi Interchange|Haemi IC]] || 해미나들목 || 海美나들목 || [[File:Korea National Route No.45.svg|20px]] [[National Route 45 (South Korea)|National Route 45]] [[Haemieupseong]] || 13.68 || 237.80 || || rowspan="3" | [[Seosan]]
|-
! SA
|| Seosan SA || 서산휴게소 || 西山休憩所 || || || ||
|-
! 23
|| [[Seosan Interchange|Seosan IC]] || 서산나들목 || 西山나들목 || [[File:Korea National Route No.32.svg|20px]] [[National Route 32 (South Korea)|National Route 32]] || 10.78 || 248.52 ||
|-
! 24
|| [[Dangjin Junction|Dangjin JC]] || 당진분기점 || 唐津分岐點 || [[File:Korea Expressway No.30.svg|20px]] [[Dangjin-Yeongdeok Expressway]] || 6.56 || 255.08 || || rowspan="4" | [[Dangjin]]
|-
! 25
|| [[Dangjin Interchange|Dangjin IC]] || 당진나들목 || 唐津나들목 || [[File:Korea National Route No.34.svg|20px]] [[National Route 34 (South Korea)|National Route 34]] || 9.39 || 264.47 ||
|-
! 26
|| [[Songak Interchange|Songak IC]] || 송악나들목 || 松岳나들목 || [[File:Korea National Route No.38.svg|20px]] [[National Route 38 (South Korea)|National Route 38]] Dangjin Steelworks || 8.07 || 272.54 ||
|-
! SA
|| Haengdam Island SA (Ocean Park Resort) || 행담도휴게소 || 行淡島休憩所 || || || || In the Seohae Grand Bridge
|-
! BR
|| '''[[Seohae Bridge]]''' || '''서해대교''' || '''西海大橋''' || || || || || rowspan="4" | [[Pyeongtaek]] || rowspan="18" | [[Gyeonggi Province|Gyeonggi]]
|-
! 27-1
|| [[Poseung Junction|Poseung JC]] || 포승분기점 || 浦升分岐點 || [[Korea Expressway No.17.svg|20px]] [[Iksan–Pyeongtaek Expressway Branch]] || || ||
|-
! 27
|| [[West Pyeongtaek Interchange|W Pyeongtaek IC]] || 서평택나들목 || 西平澤나들목 || [[File:Korea National Route No.82.svg|20px]] [[National Route 82 (South Korea)|National Route 82]] || 12.64 || 285.18 ||
|-
! 28
|| [[West Pyeongtaek Junction|W Pyeongtaek JC]] || 서평택분기점 || 西平澤分岐點 || [[File:Korea Expressway No.40.svg|20px]] [[Pyeongtaek–Jecheon Expressway]] [[File:Korea Expressway No.153.svg|20px]] [[Pyeongtaek-Siheung Expressway]] || 6.53 || 291.71 ||
|-
! 29
|| [[Baran Interchange|Baran IC]] || 발안나들목 || 發安나들목 || [[File:Korea National Route No.39.svg|20px]] [[National Route 39 (South Korea)|National Route 39]] || 7.82 || 299.53 || || rowspan="6" | [[Hwaseong, Gyeonggi|Hwaseong]]
|-
! 29-1
|| [[Paltan Junction|Paltan JC]] || 팔탄분기점 || 八灘分岐點 || [[File:Korea Expressway No.400.svg|20px]] [[Capital Region Second Ring Expressway]] || || ||
|-
! SA
|| Hwaseong SA || 화성휴게소 || 華城休憩所 || || || ||
|-
! 30
|| [[Bibong Interchange|Bibong IC]] || 비봉나들목 || 飛鳳나들목 || [[File:Korea National Route No.39.svg|20px]] [[National Route 39 (South Korea)|National Route 39]] || 13.62 || 313.15 ||
|-
! SA
|| Maesong SA || 매송휴게소 || 梅松休憩所 || || || ||
|-
! 31
|| [[Maesong Interchange|Maesong IC]] || 매송나들목 || 梅松나들목 || [[Local Route 84 (South Korea)|Local Route 84]] || 4.02 || 317.17 ||
|-
! 31-1
|| [[Palgok Junction|Palgok JC]] || 팔곡분기점 || 八谷分岐點 || [[File:Korea Expressway No.50.svg|20px]] [[Yeongdong Expressway]] || 3.80 || 320.97 || Mokpo-bound enter only Gangneung-bound exit only || rowspan="3" | [[Ansan]]
|-
! 32
|| [[Ansan Junction|Ansan JC]] || 안산분기점 || 安山分岐點 || [[File:Korea Expressway No.50.svg|20px]] [[Yeongdong Expressway]] || 5.12 || 326.09 ||
|-
! TG
|| [[West Seoul Tollgate|W. Seoul TG]] || 서서울요금소 || 西서울料金所 || || || || Main Tollgate
|-
! 33
|| [[Jonam Junction|Jonam JC]] || 조남분기점 || 鳥南分岐點 || [[File:Korea Expressway No.100.svg|20px]] [[Capital Region First Ring Expressway]] || 2.89 || 328.98 || || rowspan="3" | [[Siheung]]
|-
! SA
|| Mokgam SA || 목감간이휴게소 || 牧甘簡易休憩所 || || || || Seoul-bound only
|-
! 34
|| [[Mokgam Interchange|Mokgam IC]] || 목감나들목 || 牧甘나들목 || [[File:Korea National Route No.42.svg|20px]] [[National Route 42 (South Korea)|National Route 42]] [[File:Korea Expressway No.17.svg|20px]] [[Suwon–Munsan Expressway]] [[Image:KR road sign 301 (obsolete).svg|20px]] [[Third Gyeongin Expressway|3rd Gyeongin Highway]]|| 3.16 || 332.14 ||
|-
! 35
|| [[Gwangmyeong Station Interchange|Gwangmyeong Stn. IC]] || 광명역나들목 || 光明驛나들목 || Ori-ro [[File:KTX logo.svg|30px]] [[Gwangmyeong Station|KTX Gwangmyeong Stn.]] || 1.15 || 333.29 || || [[Anyang]]
|-
! 36
|| [[Iljik Junction|Iljik JC]] || 일직분기점 || 日直分岐點 ||[[File:Korea Expressway No.110.svg|20px]] [[Second Gyeongin Expressway|2nd Gyeongin Expressway]] || 2.67 || 335.96 || || [[Gwangmyeong]]
|-
! 37
|| [[Soha Junction|Soha JC]] || 소하분기점 || 所下分岐點 || [[File:Korea Expressway No.17.svg|20px]] [[Suwon-Munsan Expressway]] [[Gangnam Beltway]] || || || Gangnam-bound only Mokpo-bound only || rowspan="3" | [[Geumcheon District|Geumcheon]] || rowspan="3" | [[Seoul]]
|-
! 38
|| [[Geumcheon Interchange|Geumcheon IC]] || 금천나들목 || 衿川나들목 || [[National Route 1 (South Korea)|National Route 1]] [[File:South Korea subway logo.svg|20px]] [[Doksan Station]] ([[File:Seoul Metro Line 1.png|20px]] [[Seoul Subway Line 1|Line 1]]) || 4.20 || 340.16 || Seoul-bound enter only Mokpo-bound exit only
|-
!
|| Seoul || 서울 종점 || 서울 終點 || [[Seobu Urban Expressway]] || 0.65 || 340.81 ||
|-
! colspan="10" | Connected directly with [[Seobu Urban Expressway]](서부간선도로)
|}

==Events==
[[Munhwa Broadcasting Corporation|MBC]]'s Entertainment program, [[Infinite Challenge]] held a <Seohaean Expressway Festival> in Haengdam Island Service area in June 2011.

==See also==
* [[Roads and expressways in South Korea]]
* [[Transportation in South Korea]]

==External links==
* [http://www.ex.co.kr KEC] ([[Korea Expressway Corporation]])
* [http://english.molit.go.kr MOLIT] [[Government of South Korea|South Korean Government]] [[Ministry of Land, Infrastructure and Transport (Korea)|Transport Department]]

{{Public transport in the Seoul Metropolitan Area}}

{{South Korean expressways}}

{{coord missing|South Korea}}

[[Category:Seohaean Expressway| ]]
[[Category:Expressways in South Korea]]
[[Category:Roads in South Jeolla]]
[[Category:Roads in North Jeolla]]
[[Category:Roads in South Chungcheong]]
[[Category:Roads in Gyeonggi]]
[[Category:Roads in Seoul]]

Seohaean Expressway - Revision history

imported>Dawnseeker2000: category:articles with missing files