The (lit. West

Shōnan is the name of a region along the coast of Sagami Bay in Kanagawa Prefecture, central Japan. Centered on Sagami River, about 60 kilometers southwest of Tokyo Tokyo, officially the Tokyo Metropolis, is the capital of Japan, capital and ...

Bypass) is a

toll road A toll road, also known as a turnpike or tollway, is a public or private road for which a fee (or ''Toll (fee), toll'') is assessed for passage. It is a form of road pricing typically implemented to help recoup the costs of road construction and ...

Kanagawa Prefecture is a Prefectures of Japan, prefecture of Japan located in the Kantō region of Honshu. Kanagawa Prefecture is the List of Japanese prefectures by population, second-most populous prefecture of Japan at 9,221,129 (1 April 2022) and third-dens ...

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

. 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 lies south of Kanagawa Prefecture in Honshu, central Japan, contained within the scope of the Miura Peninsula, in Kanagawa, to the east, the Izu Peninsula, in Shizuoka Prefecture, to the west, and the Shōnan coastline to the north, while the i ...

, facilitating access between the

Tokyo Tokyo, officially the Tokyo Metropolis, is the capital of Japan, capital and List of cities in Japan, most populous city in Japan. With a population of over 14 million in the city proper in 2023, it is List of largest cities, one of the most ...

urban area and the city of

Odawara is a Cities of Japan, city in Kanagawa Prefecture, Japan. , the city had an estimated population of 188,482 and a population density of 1,700 persons per km2. The total area of the city is . Geography Odawara lies in the Ashigara Plains, in ...

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 is a List of towns in Japan, town in Kanagawa Prefecture, Japan. , the town had a population of 10,965, and total area of . Hakone is a notable spa town and a popular tourist destination due to its many onsen, hot springs being within view of ...

, while a short branch route terminates at an intersection with National Route 135 which leads to the resort town of

Atami is a city located in Shizuoka Prefecture, Japan. , the city had an estimated population of 36,865 in 21,593 households

and the

Izu Peninsula The is a mountainous peninsula with a deeply indented coastline to the west of Tokyo on the Pacific Ocean, Pacific coast of the island of Honshu, Japan, the largest of the four main islands of Japan. Formerly known as Izu Province, Izu peninsu ...

. 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 The is the official currency of Japan. It is the third-most traded currency in the foreign exchange market, after the United States dollar and the euro. It is also widely used as a third reserve currency after the US dollar and the euro. T ...

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 Electronic toll collection (ETC) is a wireless system to automatically collect the usage fee or Road pricing, toll charged to vehicles using toll roads, HOV lanes, toll bridges, and toll tunnels. It is a faster alternative which is replacing Tol ...

(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 Interchange may refer to: Transport * Interchange (road), a collection of ramps, exits, and entrances between two or more highways * Interchange (freight rail), the transfer of freight cars between railroad companies * Interchange station, a rai ...

, JCT - junction, PA -

parking area A parking lot or car park (British English), also known as a car lot, is a cleared area intended for parking vehicles. The term usually refers to an area dedicated only for parking, with a durable or semi-durable surface. In most jurisdic ...

, TB -

toll gate Toll Gate or Tollgate may refer to: * Toll gate, a barrier across a toll road or toll bridge that is lifted when the toll is paid Entertainment * Tollgate (Hale single), "Tollgate" (Hale single) * ''The Toll-Gate'', a 1954 novel by Georgette Heye ...

Main Route

Ishibashi Branch Route

References

External links

Central Nippon Expressway Company
{{DEFAULTSORT:Seisho Bypass Toll roads in Japan 1967 establishments in Japan