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The video above shows the tight twists and turns of Irohazaka in Nikko. The speed limit is 40km/h but most drivers don't get above 30km/h. One motorcyclist has just been arrested for doing 102km/h on his 1000cc bike. He was on a straight stretch, where the road widens to a two-car width, but it was still some feat.
News in Japanese here via zarutoro