Explore details about location 国道２０号. 国道２０号 is a location situated within the 上野原市 alongside other areas such as 中央自動車道, 上野原丹波山線, 四日市場上野原線. Additionally, some smaller parts of 国道２０号 include specific areas like 中央自動車道, 中央自動車道 (CHUO EXPRESSWAY) adding to the diversity of its landscape.