When Heian kyo was constructed, Toba no Tsukurimichi (Toba New Road) an extension of Suzaku Oji, was built, and Toba also functioned as the outer port of Heian kyo.
平安京造営時に朱雀大路を延長した鳥羽作道も作られ、鳥羽は平安京の外港としての機能を持った。