[1] Route 9 begins at Hakozaki Junction with the Mukojima Route in Chūō City above Tokyo City Air Terminal, a bus terminal for Airport Transport Service, an airport bus operator.

From there it travels southeast crossing over the Sumida River into Kōtō City.

Just before reaching Kiba Park the route turns south entering the part of Kōtō City made up of artificial islands on the northern edge of Tokyo Bay.

Upon reaching the bay, the expressway terminates at Tatsumi Junction where it meets the bypass of Tokyo, the Bayshore Route.

[3] According to a 2015 survey conducted by the Ministry of Land, Infrastructure, Transport and Tourism, the road carried an average of 52,473 vehicles per day.