Japan National Route 252National Route 252 is a national highway of Japan connecting Kashiwazaki, Niigata and Aizuwakamatsu, Fukushima in Japan, with a total length of 204.6 km.Route descriptionA section of National Route 252 in the town of Kaneyama in Fukushima Prefecture is a musical road. Parts of the highway close in winter, making the Tadami line the only means of transport between several towns.