Also regarded as an important path to complement the road was Shimogamo-Otsu Line of Kyoto prefectural road and Shiga prefectural road No. 30, which crossed over Higashiyama (Kyoto Prefecture) in the upstream area of Shira-kawa River.
また、白川上流の東山(京都府)を越える京都府道・滋賀県道30号下鴨大津線もこれを補完する経路として重要視された。