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Although it is comparatively comparatively easy to run the national highway No. 309 line by a 1.5 lane width grade up to a Mitarai ravine, if a Mitarai ravine is passed, it passes through a tunnel and it runs for a while, it will become narrower and so narrower that road width is difficult also for passing each other. It just enters and goes by the air of the way of an old peak into a deep mountain. |