| 词条 | Sakanashi Tunnel |
| 释义 |
| name = Sakanashi Tunnel | image =File:Sakanashi Tunnel (Tokyo-bound entrance).jpg | image_size = 250px | caption = The northern entrance to the Tokyo-bound side of the Sakanashi Tunnel | pushpin_map = Japan Aomori Prefecture#Japan | route = Tōhoku Expressway | crosses = Sakanashi Pass and the border of Aomori and Akita Prefectures | location = Approx. {{convert|58|km|mi|abbr=on}} south of Aomori Interchange | operator = East Nippon Expressway Company | character = Twin-bore tunnel | length = {{convert|4254|m|ft|abbr=on}} southbound {{convert|4265|m|ft|abbr=on}} northbound | width = | height = | vpd = | opened = July 30, 1986 | coordinates = {{coord|40.412222|140.683361|type:landmark|display=title,inline}} | grade = | lowelevation = | hielevation = }} The Sakanashi Tunnel (坂梨トンネル Sakanashi Tonneru) is a tunnel on the border of Akita Prefecture and Aomori Prefecture on the Tōhoku Expressway. The tunnel crosses Sakanashi Pass of the northern Ōu Mountain Range. Its {{convert|4.27|km|mi|adj=mid|-long}} northbound tunnel is the longest tunnel on the Tōhoku Expressway.[1][2] Its completion in 1986 was one of the final pieces of the {{convert|679.5|km|mi|abbr=on|adj=on}} Tōhoku Expressway from Tokyo to Aomori. DescriptionThe northbound bore of the tunnel is {{convert|4.27|km|mi}} long while the southbound bore is {{convert|4.25|km|mi}} long. The northern end of the tunnel sits at {{convert|333.6|m|ft}} above sea level and the southern end sits at {{convert|322.2|m|ft}}. The speed limit in the tunnel is set at 70 km/h. The tunnel is the longest on the Tōhoku Expressway.[3] Alternate routePrior to the opening of the tunnel the primary high-speed route from Morioka to Aomori was the Michinoku Toll Road. That route is currently being extended to relieve National Route 4 and the Tōhoku Expressway of traffic from Hachinohe to Aomori, via the Hachinohe Expressway, Second Michinoku Toll Road, and Kamikita Expressway.[4] National Route 282 runs parallel to the tunnel, but winds through the mountain pass. HistoryThe Sakanahi Tunnel opened on July 30, 1986. This allowed the expressway to open between Kazuno, Akita and Hirakawa, Aomori. References1. ^http://www.e-nexco.co.jp/effort/aging/infrastructure/pdfs/161221c.pdf 2. ^http://www.lotsberg.net/data/japan/list.html 3. ^http://www.e-nexco.co.jp/effort/aging/infrastructure/pdfs/161221c.pdf 4. ^http://www.pref.aomori.lg.jp/kotsu/build/koukikakudouro_kako_ibennto.html 5 : Road tunnels in Japan|Tunnels completed in 1986|Tōhoku Expressway|Transport in Aomori Prefecture|Transport in Akita Prefecture |
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