San'yō Expressway

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山陽自動車道
Route information
Part of AH 1
Length446.7 km (277.6 mi)
405.6 km (main line)
9.6 km (Miki branch line)
3.4 km (Hanshin branch line)
28.1 km (Ube branch line)
Existed1982-1997–present
Major junctions
FromKobe JCT(Kobe 神戸, Hyōgo)
ToYamaguchi JCT(Yamaguchi 山口, Yamaguchi)
Shimonoseki JCT(Shimonoseki 下関, Yamaguchi)
Location
CountryJapan
Major citiesKobe, Himeji, Okayama, Fukuyama, Hiroshima, Iwakuni, Yamaguchi
Highway system

The San'yō Expressway (山陽自動車道, San'yō Jidōshadō) (Asian Highway Network AH 1) is an expressway in Japan, running from Kobe through Hiroshima along the Inland Sea and terminating in Yamaguchi Prefecture. The entire length of the expressway was opened in 1997. The main line has a total length of 405.6 kilometers.

List of interchanges and features

Main Route

Number Name Connections Distance from Kōbe (km) Bus Stop Notes Location
Through to Shin-Meishin Expressway
(5-1) Kōbe JCT Chūgoku Expressway 0.0 Kita-ku, Kobe Hyōgo
1 Kōbe-Kita IC/
Hata BS
Rokkō-Kita Toll Road 2.6
- Ōgō PA - 7.3
- Ōgō BS - 12.3
2 Miki JCT for Akashi Kaikyō Bridge (Kimi Branch) 15.4 Miki
- Shijimi BS - 16.8
3 Miki-Higashi IC Hyōgo Prefectural Route 85 18.0
- Kurumi BS - 23.1
- Miki SA - 25.5
4 Miki-Ono IC Japanese National Route Sign 0175.svg National Route 175 (Miki-Ono Bypass) 27.7
- Ono BS - 30.2 Ono
- Gongenko PA - 36.1
36.5
for Kobe, Osaka
for Okayama
Kakogawa
5 Kakogawa-Kita IC Hyōgo Prefectural Route 43 41.2
- Shikitō BS - 46.5 Himeji
6 San'yō Himeji-Higashi IC Japanese National Route Sign 0372.svg National Route 372
Japanese National Route Sign 0312.svg Bantan Renraku Road
49.8
- Shiratori PA - 60.7
61.6
for Kobe, Osaka
for Okayama
7 San'yō Himeji-Nishi IC Japanese National Route Sign 0029.svg National Route 29 (Himeji-Nishi Bypass) 62.7
8 Tatsuno IC Hyōgo Prefectural Route 29 69.3 Tatsuno
9 Tatsuno-Nishi IC/SA Hyōgo Prefectural Route 93
Hyōgo Prefectural Route 121
73.7
9-1 Harima JCT Harima Expressway 74.7
- Aioi BS - 78.3 Aioi
10 Akō IC Okayama/Hyōgo Prefectural Route 96 88.3 Akō
- Fukuishi PA - 95.0 Bizen Okayama
11 Bizen IC Japanese National Route Sign 0002.svg National Route 2 98.8
12 Wake IC Japanese National Route Sign 0374.svg National Route 374 109.1 Wake District, Wake
- Seto PA - 116.9
117.7
for Kobe
for Okayama, Hiroshima
Higashi-ku, Okayama
- Seto JCT Mimasaka-Okayama Road (planned) 119.3 Expected to open in 2022
13 San'yō IC Okayama Prefectural Route 37 123.2 Akaiwa
- Kasaiyama Tunnel - Kita-ku, Okayama
14 Okayama IC Japanese National Route Sign 0053.svg National Route 53 (Okayama-Kita Bypass) 136.8
14-1 Kibi SA/SIC 138.4
15 Okayama JCT Okayama Expressway 143.9 -
16 Kurashiki JCT for Seto-Chūō Expressway (Hayashima Branch) 150.3 - Kurashiki
17 Kurashiki IC Japanese National Route Sign 0429.svg National Route 429 152.4
18 Tamashima IC Okayama Prefectural Route 54 161.9
- Michiguchi PA - 166.5
19 Kamogata IC Okayama Prefectural Route 155 171.9 Asakuchi
20 Kasaoka IC Okayama Prefectural Route 34 180.1 Kasaoka
- Shinosaka PA - 185.3
21 Fukuyama-Higashi IC Japanese National Route Sign 0182.svg National Route 182
(Fukuyama Loop Road)
191.7 Fukuyama Hiroshima
- Senda BS - 194.4
21-1 Fukuyama SA/SIC 200.3
200.5
For Okayama, Osaka
for Hiroshima
- Fukuyama-Hongō BS - 207.6
22 Fukuyama-Nishi IC Japanese National Route Sign 0002.svg National Route 2 (Matsunaga Bypass) 208.6
22-1 Onomichi JCT E54 Onomichi Expressway 213.1 Onomichi
23 Onomichi IC Japanese National Route Sign 0184.svg National Route 184 214.5
- Yahata PA - 222.2
222.5
For Hiroshima, Kitakyūshū
for Okayama
Mihara
24 Mihara-Kui IC Japanese National Route Sign 0486.svg National Route 486
Hiroshima Prefectural Route 25
227.2
- Takasaka PA - 231.4 BS for connections only
expressway entrance/exit prohibited
24-1 Hongō IC Hiroshima Prefectural Route 82 238.5
25 Kōchi IC Hiroshima Prefectural Route 73
Japanese National Route Sign 0432.svg National Route 432
246.7 Higashihiroshima
- Kodani SA - 249.7
250.0
For Hiroshima, Kitakyūshū
for Fukuyama, Okayama
25-1 Takaya JCT E75 Higashihiroshima-Kure Expressway 252.8
26 Saijō IC Hiroshima Prefectural Route 59
Japanese National Route Sign 0375.svg National Route 375 (Misonō Bypass)
257.8
27 Shiwa IC Hiroshima Prefectural Route 83 268.8
- Okuya PA - 270.9
28-1
28
Hiroshima-Higashi IC Japanese Urban Expwy Sign 0001.svg Hiroshima Expressway Route 1
Hiroshima Prefectural Route 70
279.2 Higashi-ku, Hiroshima
29 Hiroshima IC Japanese National Route Sign 0054.svg National Route 54 (Gion Bypass) 285.6 Asaminami-ku, Hiroshima
- Numata PA - 291.2
30 Hiroshima JCT Hiroshima Expressway 293.1
31 Itsukaichi IC Hiroshima Prefectural Route 71 296.1 Saeki-ku, Hiroshima
31-1 Miyajima SA/SIC 306.2 Hatsukaichi
32 Hatsukaichi JCT Hiroshima-Iwakuni Road for Hatsukaichi, Miyajima 310.4
32-2 Ōno IC Hiroshima Prefectural Route 289 315.1
32-3 Ōtake IC Japanese National Route Sign 0002.svg National Route 2 323.4 Ōtake
<33> Ōtake JCT Japanese National Route Sign 0002.svg National Route 2 Iwakuni-Ōtake Road (planned) 324.1
- Sekido Tunnel - Ōsaka-bound 3,325 m
Kitakyūshū-bound 3,217 m
Iwakuni Yamaguchi
34 Iwakuni IC Japanese National Route Sign 0002.svg National Route 2
Yamaguchi/Hiroshima Prefectural Route 1
332.6
- Kuga PA - 344.2
35 Kuga IC Yamaguchi Prefectural Route 70 346.7
36 Kumage IC Yamaguchi Prefectural Route 8 358.9 Shūnan
- Kudamatsu SA - 364.8 Kudamatsu
- Mimitori Tunnel - Ōsaka-bound 67 m
Kitakyūshū-bound 72 m
Shūnan
37 Tokuyama-Higashi IC Japanese National Route Sign 0002.svg National Route 2 (Shūnan Bypass) 370.7
38 Tokuyama-Nishi IC Japanese National Route Sign 0002.svg National Route 2 388.7
- Tonomi PA - 392.2 Hōfu
39 Hōfu-Higashi IC Japanese National Route Sign 0002.svg National Route 2 (Hōfu Bypass) 401.3 for Hiroshima
40 Hōfu-Nishi IC 404.6 for Kitakyūshū
- Sabagawa SA - 407.5
41 Yamaguchi-Minami IC Japanese National Route Sign 0002.svg National Route 2 (Ogōri Bypass) 413.2 Yamaguchi
(33) Yamaguchi JCT Chūgoku Expressway 419.3 -

Kimi Branch

Number Name Connections Distance from Miki (km) Notes Location
2 Miki JCT Main Route 0.0 Miki
1 Kōbe-Nishi IC/TB Hyōgo Prefectural Route 22 9.6 TB is on Miki-bound side Nishi-ku, Kobe
E28 Kobe-Awaji-Naruto Expressway for Tokushima

Hayashima Branch

Number Name Connections Distance from Kurashiki (km) Bus Stop Notes Location
16 Kurashiki JCT for Hiroshima, Kōbe (Main Route) 0.0 - Kurashiki
1 Hayashima IC/TB Japanese National Route Sign 0002.svg National Route 2 (Okayama Bypass) 3.4 Toll gate is on Kōbe/Hiroshima-bound side Hayashima, Tsukubo District
E28 Seto-Chūō Expressway for Kojima, Sakaide

Ube-Shimonoseki Route

Number Name Connections Distance from Ube (km) Bus Stop Location
42 Ube JCT Yamaguchi-Ube Road 0.0 - Ube
43 Ube IC Japanese National Route Sign 0490.svg National Route 490 3.1
44 Onoda IC Yamaguchi Prefectural Route 71 13.2 Sanyoonoda
- Suōnada PA - 20.6
45 Habe IC Japanese National Route Sign 0002.svg National Route 2 (Asa-Habu Bypass) 22.7
(35-2) Shimonoseki JCT Chūgoku Expressway 28.1 - Shimonoseki

See also