Tokyo Metropolitan Road Route 420 東京都道420号鮫洲大山線
Route information
Length	22.859 km (14.204 mi)
Major junctions
From	Higashi-Shinagawa, Shinagawa
To	Hikawachō, Itabashi
Location
Country	Japan
Highway system
National highways of Japan Expressways of Japan

Tokyo Metropolitan Road Route 420 (東京都道420号鮫洲大山線, Tōkyōto michi 420-gō Samezu Ōyama-sen) is a metropolitan road that connects the Yashiobashi intersection in Shinagawa, Tokyo and the Nakajuku intersection in Itabashi. It passes between Route 317 (Yamate-dori) and Route 318 (Kannana-dori), and play a role in connecting them. It is sometimes referred to as the "Ring Road 6.5".^[1]

In popular culture

Tokyo Metropolitan Road Route 420 was featured on an episode of Tamori Club, which introduced this road under construction on July 13, 2013 as "(commonly known as) Ring Road 6.5".^[2]