Higashi Koya-kaido road was constructed as straight as possible without passing through any then-existing settlements and, therefore, it is said that this road was not a road which had been spontaneously formed but an ancient Japanese road which was constructed according to a plan.
既存の集落を経ず、出来るだけ直線になるように通されており、自然発生的に形成された道ではなく、計画に基づいて建設された日本の古代道路であると言われている。