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Nishi-Seto Expressway

Linking a series of islands

The western route, Nishi-Seto Expressway, is 46.6 kilometers long from Onomichi in Honshu to Imabari in Shikoku.

This route consists of nine long span bridges and connects seven islands.

The total population of these islands is about 100,000. The long-span bridge has been opened to traffic since 1979.

Finally, in 1999, the Tatara Bridge, the Kurushima-Kaikyo Bridges, and the Shin-Onomichi Bridge were opened.

These long-span bridges, except for the Shin-Onomichi Bridge, accommodate pedestrians, bicycles, and motorcycles (not larger than 125cc.).

This is the special feature of this route among the three routes of Honshu-Shikoku Bridges.

In addition, the driveway with a full length (including 12.8 kilometers of Highway (only for vehicles)) of 59.4 kilometers is called "Shimanami Highway".


ItemsBetween Nishiseto-Onomichi IC and Ikuchijima-Kita IC
in Nishi-Seto Expressway
1. Route

2. Location




3. Length





4. Construction Cost



5. History














6. Present Conditions
National Highway 317

From: 1219-10, Aza-Saigakubo, Takasu town, Onomichi city, Hiroshima Pref. (Nishiseto-Onomichi IC)
To: 580-2, Aza-Fukakubo, Innoshima-Sunoe town, Onomichi city, Hiroshima Pref. (Ikuchijima-Kita IC)

18.0 km
Number of bridges: 21, Total length of the bridges: 5.7 km
(Among them, the lengths of Shin-Onomichi Bridge, Innoshima Bridge and Ikuchi Bridge are 546m, 1,270m and 790m, respectively.)
Length of earth work: 12.3 km

About 40 Billion JPY (Shin-Onomichi Bridge related portion)
About 68 Billion JPY (Innoshima Bridge related portion)
About 45 Billion JPY (Ikuchi Bridge related portion)

December 4, 1983:
- Highway between Mukaihigashi Ramp and Innoshima IC is put in service.
December 8, 1991:
- Highway between Innoshima-Minami IC and Ikuchijima-Kita IC is put in service.
April 1, 1998:
- Highway between Innoshima-Kita IC and Innoshima-Minami IC is put in service.
March 13, 1999:
- Highway between Nishiseto-Onomichi IC and Onomichi-Ohashi Ramp is put in service (the number of lanes increases two to four.).
May 1, 1999:
- Highway between Onomichi-Ohashi Ramp and Mukaihigashi Ramp is put in service.

Fully-access-controlled highway
- Number of lanes: two, temporarily (four, partially)
- Restricted speed: 70 km/hour
Motor bicycle, bicycle and pedestrian way
- Innoshima Bridge related portion
--- Width: 4 m
--- Length: 1.4 km
- Ikuchi Bridge related portion
--- Width: 2.5 m
--- Length: 1.2 km (for bicycle and pedestrian way)
---1.4 km (for motor bicycle)

Mukaihigashi Ramp was disused on May 1, 1999 when all portions were put in service.

Shin-Onomichi Bridge(Competed in 1999)
Cable stayed bridge (Total length: 546 m, Center span: 215 m)

Innoshima Bridge(Completed in 1983)
Suspension bridge (Total length: 1,270 m, Center span: 770 m)

Ikuchi Bridge(Completed in 1991)
Cable stayed bridge (Total length: 790 m, Center span: 490 m)

ItemsBetween Ikuchijima-Minami IC and Ohshima-Kita IC in Nishi-Seto Expressway
1. Route

2. Location




3. Length






4. Construction Cost



5. History







6. Present Conditions
National Highway 317

From: 986, Aza-Hosenbara, Ogi, Setoda town, Onomichi city, Hiroshima Pref. (Ikuchijima-Minami IC)
To: 4658-2, Miyakubo, Miyakubo town, Imabari city, Ehime Pref. (Ohshima-Kita IC)

16.1km
Number of bridges: 26, Total length of the bridges: 5.8 km
(Among them, the lengths of Tatara Bridge, Ohmishima Bridge and Hakata-Ohshima Bridge are 1,480 m, 328 m and 1,230 m, respectively.)
Number of tunnel: 1, Length of tunnel: 1.4km
Length of earth work: 8.9 km

About 140 Billion JPY (Tatara Bridge related portion)
About 19 Billion JPY (Ohmishima Bridge related portion)
About 41 Billion JPY (Hakata-Ohshima Bridge related portion)

May 13, 1979:
- Highway between Ohmishima IC and Hakatajima IC is put in service.
January 17, 1988:
- Highway between Hakatajima IC and Ohmishima-Kita IC is put in service.
May 1, 1999:
- Highway between Ikuchijima-Minami IC and Ohshima-Minami is put in service.

Fully-access-controlled highway
- Number of lanes: two, temporarily (four, partially)
- Restricted speed: 70 km/hour
Motor bicycle, bicycle and pedestrian way
- Tatara Bridge related portion
--- Width: 2.5 m
--- Length: 1.5 km
- Ohmishima Bridge related portion
--- Width: 4 m
--- Length: 0.7 km
- Hakata-Ohshima Bridge related portion
--- Width: 4 m
--- Length: 1.5 km

Tatara Bridge(Completed in 1999)
Cable stayed bridge (Total length: 1,480 m, Center span: 890 m)

Ohmishima Bridge(Completed in 1979)
Arch bridge (Total length: 328 m, Center span: 297 m)

Hakata-Ohshima Bridge (Completed in 1988)
Hakata Bridge: Steel box girder bridge (Total length: 325 m, Center span: 145 m)
Ohshima Bridge: Suspension bridge (Total length: 840 m, Center span: 560 m)

ItemsBetween Ohshima-Minami and Imabari IC in Nishi-Seto Expressway
1. Route

2. Location



3. Length






4. Construction Cost

5. History


6. Present Conditions
National Highway 317

From: 3614-1, Myo, Yoshiumi town, Imabari city, Ehime Pref. (Ohshima-Minami IC)
To: 150, Aza-Sugegatani, Yata, Imabari city, Ehime Pref. (Imabari IC)

12.5km
Number of bridges: 8, Total length of the bridges: 7.0 km
(Among them, the lengths of First, Second and Third Kurushima-Kaikyo Bridges are 960 m, 1,515 m and 1,570 m, respectively.)
Number of tunnels: 2, Total length of the tunnels: 1.5 km
Length of earth work: 4.0 km

About 340 Billion JPY (Kurushima-Kaikyo Bridges related portion)

May 1, 1999:
- Highway between Ohshima-Minami IC and Imabari IC is put in service.

Fully-access-controlled highway
- Number of lanes: two, temporarily (four, partially)
- Restricted speed: 70 km/hour
- Motor bicycle, bicycle and pedestrian way
--- Width: 2.5 m
--- Length: 3.8 km

Kurushima-Kaikyo Bridges (Completed in 1999)
1st Kurushima-Kaikyo Bridge: Suspension bridge (Total length: 960 m, Center span: 600 m)
2nd Kurushima-Kaikyo Bridge : Suspension bridge (Total length: 1,515 , Center span: 1,020 m)
3rd Kurushima-Kaikyo Bridge: Suspension bridge (Total length: 1,570 m, Center span: 1,030 m)

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