Shinopii (22 February 2017). "日本全国にメロディーロードは28箇所ある!" [The 28 Melody Roads of Japan] (in Japanese). Retrieved 18 February 2020.
mlit.go.jp
"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 19 February 2020.