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is a major highway on the island of Kyūshū in Japan. It connects the prefectural capital cities of Kagoshima (Kagoshima Prefecture, Kumamoto (Kumamoto Prefecture), and Fukuoka (Fukuoka Prefecture), passing through Kurume as well.
Its northern terminus is Moji-ku, Kitakyushu, where it meets National Route 2.
The total length of Route 3 is 392.1 km.