Explore details about location 国道２０号. 国道２０号 is a location situated within the 大月市 alongside other areas such as 国道２０号, 国道１３９号, 梁川猿橋線. Additionally, some smaller parts of 国道２０号 include specific areas like 中央自動車道 (CHUO EXPRESSWAY) adding to the diversity of its landscape.