Toyohama tunnel, Road tunnel in Hokkaido, Japan
Toyohama is a road tunnel in Hokkaido, Japan, running 2228 meters through the mountains between Yoichi and Furubira. The bore follows National Highway 229 along the coast and cuts through solid rock with emergency exits every few hundred meters.
In February 1996, a massive rock collapsed through the ceiling of the old structure and tore open a gap of 40 meters, killing twenty people. This event led to stricter safety regulations for tunnel construction across Japan and prompted a complete rebuild with reinforced walls.
The name Toyohama refers to the coastal geography linking two fishing towns along the Sea of Japan. Local residents rely on this route daily to move wine grapes from Yoichi or bring fresh seafood inland from Furubira.
Drivers should turn on headlights and watch for speed signs, as visibility changes quickly inside. Ventilation systems run continuously to keep the air clear while cameras monitor traffic flow throughout.
After reconstruction, engineers installed sensors deep in the rock that measure movement and send alerts if the cliff face shifts. This monitoring technology is now used worldwide as a model for tunnel safety in areas at risk.
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