The (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 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. 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.
Interchange list
IC - interchange, JCT - junction, PA - parking area, TB - toll gate
Main Route
NameConnectionsDist. fromOriginNotesLocation(all in Kanagawa)Through to Seishō Bypass (toll-free section)Seishō-Ninomiya IC National Route 10.0NinomiyaTachibana IC/Tachibana TB/Seishō PA National Route 12.8IC: Ninomiya-bound entrance and exit onlyPA: Ninomiya-bound onlyOdawaraKōzu IC/Seishō PA National Route 1Pref. Route 72 (Matsuda Kōzu Route)5.5PA: Hakone-bound onlySakawa IC National Route 18.0Ninomiya-bound entrance onlyOdawara IC National Route 19.6Ninomiya-bound entrance, Hakone-bound exit onlyHayakawa JCT Ishibashi Branch Route11.6Hayakawa IC12.2Ninomiya-bound entrance, Hakone-bound exit onlyHakone Turnpike↓Ninomiya-bound entrance, Hakone-bound exit onlyOdawara-nishi IC Odawara-Atsugi Road13.8Local road access via Odawara-Atsugi Road onlyHakoneguchi IC National Route 114.5Through to Odawara-Hakone Road
Ishibashi Branch Route
NameConnectionsDist. fromOriginNotesLocation(all in Kanagawa)Hayakawa JCT Main Route11.6OdawaraOdawara Blue Way Bridge↓Ishibashi IC National Route 13513.4
References
External links Central Nippon Expressway Company