is a principle local road that stretches from Nishigotanda, Shinagawa in Tokyo to Kanagawa-ku, Yokohama in Kanagawa. With the Marukobashi intersection as the boundary, the direction of Gotanda is commonly called the Nakahara Highway, and the direction of Tsunashima is known as the .
Tsunashina Kaido has a total length of . The Tokyo, Kawasaki and Yokohama sections of the road have a length of 7,210, 3,276, and 9,540 m respectively.