From there it travels west through Tsurumi where it enters a tunnel that carries the majority of the length of the expressway.

At the eastern entrance to the tunnel the expressway has a partial interchange with National Route 1.

[1] At the western entrance to the tunnel there is another interchange, this one is with Kanagawa Prefecture Route 13.

The expressway terminates at that highway, but also has access to the local streets in the Tsuzuki Ward where it ends.

[2] The speed limit along the entire length of the Yokohama North Route is set at 60 km/h.