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Seto-Chuo Expressway

Huge Double Deck Structures

The Central route, Seto-Chuo Expressway & JR Seto-Ohashi Line, is for both a highway and a railway.

The total lengths of highway and railway are about 39 kilometers and 32 kilometers, respectively.

They were opened to traffic in April 1988.

This route consists of six long-span bridges (Shimotsui-Seto Bridge, Hitsuishijima Bridge, Iwakurojima Bridge, Yoshima Bridge, Kita Bisan-Seto Bridge, and Minami Bisan- Seto Bridge) which cross the 9.4 kilometers strait.

The upper and lower decks of the stiffening girder are for highway traffic and railway.

These six long-span bridges are called the Seto-Ohashi Bridges.


ItemsBetween Kobe-Nishi IC and Naruto IC in Seto-Chuo Expressway
1. Route

2. Location



3. Length







4. Construction Cost

5. History


6. Present Conditions
National Highway 30

From: 2722-2, Aza-Karato, Oaza-Hayashima, Hayashima town, Tsukubo-gun, Okayama Pref. (Hayashima IC)
To: 3791-1, Kawatsu town, Sakaide city, Kagawa Pref. (Sakaide IC)

37.3km
Number of bridges: 42, Total length of the bridges: 20.8 km
(Among them, the lengths of Shimotsui-Seto Bridge, Hitsuishijima Bridge, Iwakurojima Bridge, Yoshima Bridge, Kita and Minami-Bisan Seto Bridges are 1,400 m, 790 m, 790 m, 850 m, 1,538 m and 1,648 m, respectively.)
Number of tunnels: 4, Total length of the tunnels: 1.5 km
Length of earth work: 15.0 km

About 640 Billion JPY

April 10, 1988:
- Highway between Hayashima IC and Sakaide IC is put in service.

Fully-access-controlled highway
- Number of lanes: four
- Restricted speed:
---80 km/hour (between Kojima IC and Sakaide IC)
---100 km/hour (between Hayashima IC and Kojima IC)

Seto-Chuo Expressway connects with Sanyo Expressway at Hayashima IC and with Takamatsu Expressway at Sakaide IC.


Shimotsui-Seto Bridge
Suspension bridge (Total length: 1,400 m, Center span: 940 m)

Hitsuishijima Bridge
Cable stayed bridge (Total length: 790 m, Center span: 420 m)

Iwakurojima Bridge
Cable stayed bridge (Total length: 790 m, Center span: 420 m)

Yoshima Bridge
Truss bridge (Total length: 850 m, Maximum span: 245 m)

Kita Bisan-Seto Bridge
Suspension bridge (Total length: 1,538 m, Center span: 990 m)

Minami Bisan-Seto Bridge
Suspension bridge (Total length: 1,648 m, Center span: 1,100 m)

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