The Sinsen Interchange (Norwegian: Sinsenkrysset) is a heavily trafficked, multilevel road junction in Oslo, Norway. It connects the highways Norwegian National Road 150 and Trondheimsveien. The junction has existed since the 19th century, and has grown considerably in size since then. It was enhanced with a roundabout in 1957, and was connected with National road 150 in 1962. The increase in traffic was greater than the capacity of the junction, and thus a bridge was constructed that redirected Trondheimsveien above the roundabout. Further restructuring was done in 1992, when a local tramway line was redirected outside of the interchange, and in 1994, when Riksvei 150 was directed below the roundabout.