Festning Tunnel

It runs from Bjørvika, under Akershus Fortress, The City Hall Square and Vika to Filipstad.

In 2008 and 2009, the electrical installation in the tunnel is being upgraded, financed through toll fees, costing 240 million kr.

[1] In the west, the tunnel connects to Dronning Mauds gate with a cloverleaf intersection, and also has the intersection prepared for a future Slottspark Tunnel.

After the tunnel opened in January 1990, cars remained on The City Hall Square until 1994.

In 1995, the Vika Line of the Oslo Tramway was built across the square.