The Tunsberg Tunnel is a road tunnel in the municipality of Granvin in Hordaland county, Norway. The 4,080-metre (13,390 ft) long tunnel was built from 2009 until 2011 to replace a stretch of Norwegian National Road 13 between Seim in Granvin and the municipal border with neighboring Voss municipality. That stretch of roadway was full of narrow, tight hairpin turns. The tunnel has no turns and has an maximum grade of 5.07%. It was officially opened on 20 December 2011 by Magnhild Meltveit Kleppa, the Minister of Transport and Communications at that time.