 The Sinsen Interchange, where Ring 3 meets Trondheimsveien was opened 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 the Sinsen Line of the Oslo Tramway was redirected outside of the interchange, and in 1994, when National Road 150 was directed below the roundabout.