Explore details about location 国道４２０号. 国道４２０号 is a location situated within the 豊田市 alongside other areas such as 上郷街道, 国道１５５号, 島崎豊田線. Additionally, some smaller parts of 国道４２０号 include specific areas like 作手菅沼平瀬線, 豊邦大橋 adding to the diversity of its landscape.