"一般国道の路線別、都道府県別道路現況" [Road statistics by General National Highway route and prefecture] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 15 May 2020.[permanent dead link]
"一般国道の路線別、都道府県別道路現況"(PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 17 December 2020.
kkr.mlit.go.jp
一般国道1号 (in Japanese). Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 26 November 2010.
一般国道1号 (in Japanese). Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 26 November 2010.
cbr.mlit.go.jp
"東海道の起源" [Origin of the Tōkaidō] (in Japanese). Shizuoka National Highway Office. 12 March 2020. Retrieved 12 December 2020.
toyotires.jp
ontheroad.toyotires.jp
"起点から終点まで走ったことはある? "長距離国道"TOP3" [Have you ever driven from the origin to the end? Top 3 "Long-distance national highways"] (in Japanese). Toyo Tire Corporation. 26 July 2019. Retrieved 18 December 2020.
"身近な道路が実は"日本一"!?日本一の国道を走ろう!(その1)" [The familiar road is actually the best in Japan!? Let's drive on the best national road in Japan! (Part 1)]. On the Road (in Japanese). Toyo Tire Corporation. 29 October 2019. Retrieved 1 September 2020.