Seishō Bypass

{{Infobox road

|country=JPN

|name= Seishō Bypass

|alternate_name=西湘バイパス

|marker_image= 100px

|map =

|length_km= 14.5

|length_notes=Main Route

|length_round=1

|length_ref=
1.8 km (Ishibashi Branch Route){{cite web| url= http://www.driveplaza.com/dp/SearchTop#search_map | title= E-NEXCO Drive Plaza Route Search | accessdate= 2008-06-03 }}

|established= 1967{{cite web | url= http://www.ktr.mlit.go.jp/kyoku/magazine/7_aback/4_ayumi/region_04.htm | title= 50 Years of History Online Magazine, Series 4 | author= Ministry of Land, Infrastructure and Transport, Kanto Bureau | accessdate= 2008-06-03 }}{{dead link|date=May 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

|terminus_a= Seishō-Ninomiya Interchange in Ninomiya, Kanagawa
20px 20px Seishō Bypass (toll-free section)
20px National Route 1

|terminus_b= Hakoneguchi Interchange in Odawara, Kanagawa
20px Odawara-Hakone Road
20px National Route 1
Ishibashi Interchange in Odawara, Kanagawa
20px National Route 135

}}

The {{nihongo|Seishō Bypass|西湘バイパス|Seishō Baipasu}} (lit. West Shōnan Bypass) is a toll road in Kanagawa Prefecture, Japan. It is owned and managed by Central Nippon Expressway Company.

Overview

Officially the road is designated as a bypass for National Route 1. It is also classified as a road for {{nihongo|motor vehicles only|自動車専用道路|Jidōsha Senyō Dōro}} and access is controlled with interchanges and junctions in a similar manner to national expressways in Japan.

The road closely follows the coastline of Sagami Bay, facilitating access between the Tokyo urban area and the city of Odawara in western Kanagawa Prefecture. At the eastern terminus the Seishō Bypass continues as a toll-free road managed by the Ministry of Land, Infrastructure and Transport. In the west, the main route terminates near the resort town of Hakone, while a short branch route terminates at an intersection with National Route 135 which leads to the resort town of Atami and the Izu Peninsula.

The first section of the road was opened to traffic in 1967 and the entire route was completed in 1972.{{cite web | url= http://www.dokokyo.or.jp/data/nenpyo/1972.htm | title= Construction History of Japan | author= Japan Civil Engineering Contractors' Association | accessdate= 2008-06-03 | archive-url= https://web.archive.org/web/20070217005953/http://dokokyo.or.jp/data/nenpyo/1972.htm | archive-date= 2007-02-17 | url-status= dead }} The main route has 4 lanes of traffic and the Ishibashi branch route has 2 lanes.

There are three toll collection points along the road. On the main route at the Tachibana Toll Plaza, a toll of 250 yen is collected from regular passenger cars. At Kōzu Interchange these vehicles are charged 150 yen at the eastbound exit and westbound entrance. At Ishibashi Interchange 200 yen is collected. Electronic Toll Collection (ETC) is accepted for payment, however no discount programs are in effect.

In September 2007 Typhoon Fitow caused extensive damage to the road, reducing some sections to two lanes of traffic and forcing the complete closure of other sections. The entire road was restored to full capacity on April 25, 2008.{{cite web| url= http://www.ktr.mlit.go.jp/yokohama/seishou/index.htm | title= Status of Seisho Bypass Restoration |author= Ministry of Land, Infrastructure and Transport, Kanto Bureau, Yokohama Office | accessdate= 2008-06-03 }}

Interchange list

IC - interchange, JCT - junction, PA - parking area, TB - toll gate

=Main Route=

class="wikitable"
style="border-bottom: 3px solid green;"\|Name !style="border-bottom: 3px solid green;"\|Connections !style="border-bottom: 3px solid green;"\|Dist. from Origin !style="border-bottom: 3px solid green;"\|Notes !style="border-bottom: 3px solid green;"\|Location (all in Kanagawa)
colspan="5"\|Through to 20px 20px Seishō Bypass (toll-free section)
Seishō-Ninomiya IC \|20px National Route 1 \|style="text-align: center;"\|0.0 \| \|Ninomiya
Tachibana IC/ Tachibana TB/ Seishō PA \|20px National Route 1 \|style="text-align: center;"\|2.8 \|IC: Ninomiya-bound entrance and exit only PA: Ninomiya-bound only \|rowspan="9"\|Odawara
Kōzu IC/ Seishō PA \|20px National Route 1 Pref. Route 72 (Matsuda Kōzu Route) \|style="text-align: center;"\|5.5 \|PA: Hakone-bound only
Sakawa IC \|20px National Route 1 \|style="text-align: center;"\|8.0 \|Ninomiya-bound entrance only
Odawara IC \|20px National Route 1 \|style="text-align: center;"\|9.6 \|Ninomiya-bound entrance, Hakone-bound exit only
Hayakawa JCT \|20px 20px Ishibashi Branch Route \|style="text-align: center;"\|11.6 \|
Hayakawa IC \| \|style="text-align: center;"\|12.2 \|Ninomiya-bound entrance, Hakone-bound exit only
\|Hakone Turnpike \|style="text-align: center;"\|↓ \|Ninomiya-bound entrance, Hakone-bound exit only
Odawara-nishi IC \|20px 20px Odawara-Atsugi Road \|style="text-align: center;"\|13.8 \|Local road access via Odawara-Atsugi Road only
Hakoneguchi IC \|20px National Route 1 \|style="text-align: center;"\|14.5 \|
colspan="5"\|Through to 20px Odawara-Hakone Road

class="wikitable"

style="border-bottom: 3px solid green;"|Name

!style="border-bottom: 3px solid green;"|Connections

!style="border-bottom: 3px solid green;"|Dist. from
Origin

!style="border-bottom: 3px solid green;"|Notes

!style="border-bottom: 3px solid green;"|Location
(all in Kanagawa)

colspan="5"|Through to 20px 20px Seishō Bypass (toll-free section)

Seishō-Ninomiya IC

|20px National Route 1

|style="text-align: center;"|0.0

|Ninomiya

Tachibana IC/
Tachibana TB/
Seishō PA

|20px National Route 1

|style="text-align: center;"|2.8

|IC: Ninomiya-bound entrance and exit only
PA: Ninomiya-bound only

|rowspan="9"|Odawara

Kōzu IC/
Seishō PA

|20px National Route 1
Pref. Route 72 (Matsuda Kōzu Route)

|style="text-align: center;"|5.5

|PA: Hakone-bound only

Sakawa IC

|20px National Route 1

|style="text-align: center;"|8.0

|Ninomiya-bound entrance only

Odawara IC

|20px National Route 1

|style="text-align: center;"|9.6

|Ninomiya-bound entrance, Hakone-bound exit only

Hayakawa JCT

|20px 20px Ishibashi Branch Route

|style="text-align: center;"|11.6

Hayakawa IC

|style="text-align: center;"|12.2

|Ninomiya-bound entrance, Hakone-bound exit only

|Hakone Turnpike

|style="text-align: center;"|↓

|Ninomiya-bound entrance, Hakone-bound exit only

Odawara-nishi IC

|20px 20px Odawara-Atsugi Road

|style="text-align: center;"|13.8

|Local road access via Odawara-Atsugi Road only

Hakoneguchi IC

|20px National Route 1

|style="text-align: center;"|14.5

colspan="5"|Through to 20px Odawara-Hakone Road

=Ishibashi Branch Route=

Image:Odawara-Blue-Way-Bridge.jpg

class="wikitable"
style="border-bottom: 3px solid green;"\|Name !style="border-bottom: 3px solid green;"\|Connections !style="border-bottom: 3px solid green;"\|Dist. from Origin !style="border-bottom: 3px solid green;"\|Notes !style="border-bottom: 3px solid green;"\|Location (all in Kanagawa)
Hayakawa JCT \|20px 20px Main Route \|style="text-align: center;"\|11.6 \| \|rowspan="3"\|Odawara
Odawara Blue Way Bridge \| \|style="text-align: center;"\|↓ \|
Ishibashi IC \|20px National Route 135 \|style="text-align: center;"\|13.4 \|

class="wikitable"

style="border-bottom: 3px solid green;"|Name

!style="border-bottom: 3px solid green;"|Connections

!style="border-bottom: 3px solid green;"|Dist. from
Origin

!style="border-bottom: 3px solid green;"|Notes

!style="border-bottom: 3px solid green;"|Location
(all in Kanagawa)

Hayakawa JCT

|20px 20px Main Route

|style="text-align: center;"|11.6

|rowspan="3"|Odawara

Odawara Blue Way Bridge

|style="text-align: center;"|↓