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is a major highway in eastern Honshū, Japan. The longest of the ordinary highways in Japan, it originates in Chuo-ku, Tokyo and stretches north for 743.7 km to the city of Aomori in Aomori Prefecture. From Saitama Prefecture to Iwate Prefecture, it parallels the Tōhoku Expressway; from Iwate to Aomori Prefecture, it parallels the Hachinohe Expressway. At its northern terminus, it links with Route 7.