Förbifart Stockholm (Stockholm Bypass) is a series of underground motorway tunnels currently under construction between the Kungens Kurva interchange in the south of Stockholm and the Häggvik interchange north of Stockholm. Most of this bypass, more than 17 out of 21 kilometres, is being built underground. The Swedish government decided to permit the construction of the bypass on 3 September 2009, according to a proposal by the Swedish Road Administration.
https://en.wikipedia.org/wiki/F%C3%B6rbifart_Stockholm