Interchanges on the Shimanami Kaido and Matsuyama Expressway where the direction you can go is fixed

Interchanges where JB Honshi writes that the direction of travel is limited

On its list page of interchanges for the Nishiseto Expressway (Shimanami Kaido), Honshu-Shikoku Bridge Expressway Company (JB本四高速, JB Honshi) writes the following 3 lines.

尾道大橋出入口、因島北、因島南、生口島北、生口島南、大島北、大島南及び今治北の各ICは、進行方向が制限されています。 因島北IC、生口島北IC、大島北ICは、本州方面からの出口IC、又は本州方面への入口ICです。 因島南IC、生口島南IC、大島南ICは、四国方面からの出口IC、又は四国方面への入口ICです。

Translation: “The ICs at Onomichi Ohashi entrance/exit, Innoshima-kita, Innoshima-minami, Ikuchijima-kita, Ikuchijima-minami, Oshima-kita, Oshima-minami, and Imabari-kita have a limited direction of travel. Innoshima-kita IC, Ikuchijima-kita IC, and Oshima-kita IC are exit ICs for traffic from the Honshu side, or entrance ICs for traffic toward Honshu. Innoshima-minami IC, Ikuchijima-minami IC, and Oshima-minami IC are exit ICs for traffic from the Shikoku side, or entrance ICs for traffic toward Shikoku.”

Source: E76 西瀬戸自動車道（瀬戸内しまなみ海道）｜JB本四高速

Of the ICs named in these 3 lines, 3 are in Ehime Prefecture: Oshima-kita IC (大島北IC), Oshima-minami IC (大島南IC), and Imabari-kita IC (今治北IC). Onomichi Ohashi entrance/exit (尾道大橋出入口), Innoshima-kita IC (因島北IC), Innoshima-minami IC (因島南IC), Ikuchijima-kita IC (生口島北IC), and Ikuchijima-minami IC (生口島南IC) are in Hiroshima Prefecture. Imabari IC (今治IC) is not in these 3 lines, but the page for Imabari IC itself has a different note.

Oshima-kita IC is toward Honshu, and Oshima-minami IC is toward Shikoku

On Oshima (Imabari), there are 2 ICs, north and south. The text of each page is below. The text on the Oshima-kita IC page is 3 lines in 2 bullet points.

尾道（本州）方面から、大島へご用の方はここでお降り下さい。 大島から本州方面へ行かれる方は、このICから入って下さい。 四国方面へは行けません。

Translation: “If you have business on Oshima and are coming from the Onomichi (Honshu) side, please exit here. If you are going from Oshima toward Honshu, please enter from this IC. You cannot go toward Shikoku.”

Source: E76 西瀬戸自動車道（瀬戸内しまなみ海道） 大島北IC｜JB本四高速

The text on the Oshima-minami IC page is also 3 lines in the same form.

今治（四国）方面から、大島へご用の方はここでお降り下さい。 大島から四国方面へ行かれる方は、このICから入ってください。 本州方面へは行けません。

Translation: “If you have business on Oshima and are coming from the Imabari (Shikoku) side, please exit here. If you are going from Oshima toward Shikoku, please enter from this IC. You cannot go toward Honshu.”

Source: E76 西瀬戸自動車道（瀬戸内しまなみ海道） 大島南IC｜JB本四高速

When you return to the expressway after exiting to Oshima, the direction you are going decides which IC you enter.

If you enter from Imabari IC or Imabari-kita IC, you can only go toward Honshu

The text on the Imabari-kita IC page is below.

尾道（本州）方面から、今治市内へご用の方はここで降りた方が便利です。 今治北ICから今治IC、来島海峡SA及び松山道（松山・高松方面）へは行けません。 （今治北ICから入られるお客様へ） 本四道路をご利用される場合、本州方面にしか行けません。ご注意下さい。 （今治北ICで降りられるお客様へ） 本四道路（本州方面）からお越しの場合にのみ今治北ICで降りることができます。

Translation: “If you have business in Imabari and are coming from the Onomichi (Honshu) side, it is convenient to exit here. From Imabari-kita IC, you cannot go to Imabari IC, Kurushima Kaikyo Service Area, or the Matsuyama Expressway (toward Matsuyama and Takamatsu). (To customers entering from Imabari-kita IC) If you use the Honshu-Shikoku roads, you can only go toward Honshu. Please be careful. (To customers exiting at Imabari-kita IC) You can exit at Imabari-kita IC only if you are coming from the Honshu-Shikoku roads (from the Honshu side).”

Source: E76 西瀬戸自動車道（瀬戸内しまなみ海道） 今治北IC｜JB本四高速

The text on the Imabari IC page uses the same wording about the direction you can enter in.

松山道（松山・高松方面）とは接続されておりませんのでご注意ください。 今治北ICで降りることは出来ません。 （今治ICから入られるお客様へ） 本四道路をご利用される場合、本州方面にしか行けません。ご注意下さい。 （今治ICで降りられるお客様へ） 本四道路（本州方面）からお越しの場合にのみ今治ICで降りることができます。

Translation: “Please note that it is not connected to the Matsuyama Expressway (toward Matsuyama and Takamatsu). You cannot exit at Imabari-kita IC. (To customers entering from Imabari IC) If you use the Honshu-Shikoku roads, you can only go toward Honshu. Please be careful. (To customers exiting at Imabari IC) You can exit at Imabari IC only if you are coming from the Honshu-Shikoku roads (from the Honshu side).”

Source: E76 西瀬戸自動車道（瀬戸内しまなみ海道） 今治IC｜JB本四高速

The pages say that if you enter the Nishiseto Expressway from these 2 ICs on the Shikoku side, you can only go toward Honshu. You can exit only if you come from the Honshu side of the Honshu-Shikoku roads.

“Not connected to the Matsuyama Expressway” on the Imabari IC page

The first line of the quote above is JB Honshi’s note that the Nishiseto Expressway and the Matsuyama Expressway are not connected. The page for National Route 196 Imabari Road, from the Matsuyama River and National Highway Office of the Ministry of Land, Infrastructure, Transport and Tourism, gives the purpose of the project for this section as follows.

国道196号今治道路は、高規格道路を構成する国道の自動車専用道路「今治・小松自動車道」の一部であり、 西瀬戸自動車道（瀬戸内しまなみ海道）と松山自動車道をつなぎ高規格道路ネットワークを構成することで、 地域の活性化を図ることを目的として整備するものです。

Translation: “National Route 196 Imabari Road is part of the Imabari-Komatsu Expressway (今治・小松自動車道), a national road for motor vehicles only that forms part of the high-standard road network. It is being built to connect the Nishiseto Expressway (Shimanami Kaido) and the Matsuyama Expressway, forming the high-standard road network, and to help revitalize the region.”

A table on the same page lists the length from Imabari-Komatsu Expressway Imabari IC to Imabari Yunoura IC, 10.3 km, and an issue for the project.

整備課題 瀬戸内しまなみ海道と松山自動車道との未連結

Translation: “Issue for the project: The Seto Inland Sea Shimanami Kaido and the Matsuyama Expressway are not yet connected.”

The heading at the top of the page, as seen on October 11, 2026, still reads as follows.

今治朝倉IC～今治湯ノ浦IC 令和８年度 開通予定

Translation: “Imabari-Asakura IC to Imabari Yunoura IC. Scheduled to open in fiscal year Reiwa 8 (2026).”

Source: 国道196号 今治道路｜松山河川国道事務所

The city of Imabari writes, “People coming from the Shikoku side, please do not use the expressway.”

On the sightseeing spot page of the city of Imabari (Imabari Itoyama Rental Cycle), the access section has directions for people coming from the Shikoku side. This is the original text from the “By car” row under “Access from the Imabari side.”

【四国方面から】 今治湯ノ浦IC → 約30分 → 目的地 四国方面から来られる方は高速道路はご利用にならないでください。 ※四国方面から来られる方は、今治湯ノ浦ICが最終です。 今治IC・今治北ICをご利用されると、大島南ICまで行ってしまいます。十分ご注意ください。

Translation: “[From the Shikoku side] Imabari Yunoura IC -> about 30 minutes -> destination. People coming from the Shikoku side, please do not use the expressway. *For people coming from the Shikoku side, Imabari Yunoura IC is the last one. If you use Imabari IC or Imabari-kita IC, you will end up going as far as Oshima-minami IC. Please be very careful.”

The “By car” row under “Access from the Honshu side” on the same page is only one line.

【本州・しまなみ海道方面から】今治北IC → 約5分 → 目的地

Translation: “[From the Honshu and Shimanami Kaido side] Imabari-kita IC -> about 5 minutes -> destination.”

Source: 今治糸山レンタサイクル｜観光スポット｜今治市

The title of this page, when we saw it on September 16, 2026, was “糸山サイクリングターミナル（サンライズ糸山）” (Itoyama Cycling Terminal, Sunrise Itoyama). As of October 11, 2026, the title is “今治糸山レンタサイクル” (Imabari Itoyama Rental Cycle), and the URL is the same.

To stop at Kurushima Kaikyo Service Area from the Shikoku side, enter from Imabari IC

The Imabari-kita IC page also has a section about Kurushima Kaikyo Service Area (来島海峡SA).

四国側から来島海峡SAへ行かれる場合は、今治ICから流入し、来島海峡SAへお越し下さい。来島海峡SAは上下一体型のサービスエリアです。 一般道路から今治北ICをご利用いただく場合、来島海峡SAには立ち寄れませんのでご注意下さい。

Translation: “If you are going to Kurushima Kaikyo Service Area from the Shikoku side, please enter from Imabari IC and come to Kurushima Kaikyo Service Area. Kurushima Kaikyo Service Area is a service area shared by both directions. If you use Imabari-kita IC from a general road, you cannot stop at Kurushima Kaikyo Service Area, so please be careful.”

Source: E76 西瀬戸自動車道（瀬戸内しまなみ海道） 今治北IC｜JB本四高速

Another page that introduces the logo object at Kurushima Kaikyo Service Area has the same note.

来島海峡SA(愛媛県今治市大浜町3丁目9-68)へは、西瀬戸自動車道 各ICよりお車でお越しください。 (本州方面から)西瀬戸尾道ICより約54km (四国方面から)今治ICより約5km ※今治北ICから西瀬戸自動車道に入ると来島海峡SAにはお越しになれませんので、ご注意ください。

Translation: “To get to Kurushima Kaikyo SA (3-9-68 Ohama-cho, Imabari, Ehime), please come by car from any IC on the Nishiseto Expressway. (From the Honshu side) about 54 km from Nishiseto Onomichi IC. (From the Shikoku side) about 5 km from Imabari IC. *If you enter the Nishiseto Expressway from Imabari-kita IC, you cannot get to Kurushima Kaikyo SA, so please be careful.”

Source: 来島海峡SA しまなみ海道ロゴオブジェ「しまなみピン」｜JB本四高速

On the Matsuyama Expressway, Nakayama Smart IC is the one smart IC with a direction limit

In the table “List of smart ICs directly connected to the expressway main line (NEXCO West)” (高速道路本線への直結型スマートIC実施箇所一覧（NEXCO西日本）) by West Nippon Expressway Company (NEXCO West), there is a row for Nakayama Smart IC (Iyo), between Iyo and Uchiko-Ikazaki on the Matsuyama Expressway. Its hours are all day, the vehicle types are all vehicles, and the usable directions column has the following 2 lines.

松山方面への入口 松山方面からの出口のみ

Translation: “Entrance toward Matsuyama. Exit from the Matsuyama direction only.”

Source: スマートIC実施箇所一覧｜NEXCO西日本

In the row just above it in the same table, the usable directions for Toon Smart IC (Matsuyama Expressway, between Kawauchi and Matsuyama) are “full directions” (フル方向). Among the Matsuyama Expressway smart ICs in Ehime Prefecture on this list, Nakayama Smart IC was the only one with a limit on usable directions written.

Omishima IC and Hakatajima IC had no note about a limit

Among the individual IC pages of JB Honshi, the pages for Omishima IC (大三島IC) and Hakatajima IC (伯方島IC) had no note about the direction of travel. This does not mean they say there is no limit. It means there is no statement about a limit.

The latitude and longitude of the points are from OpenStreetMap (Overpass API) junction data, collected on October 11, 2026. The wording on official pages can change. The Kurushima Kaikyo SA section on the Imabari-kita IC page had changed from the wording we saw on September 16, 2026. This article quotes the wording we saw on October 11, 2026.