Which party did the Prime Minister of Norway belong to when the Tresfjord Bridge was opened to traffic?
Tresfjord Bridge:  The prime minister Erna Solberg was at the opening ceremony, stepping in for the Minister of Transport, Ketil Solvik-Olsen. Erna Solberg: Erna Solberg (] ; born 24 February 1961) is a Norwegian politician who has been Prime Minister of Norway since October 2013 and Leader of the Conservative Party since May 2004.
Conservative Party