Lærdal Tunnel 
Total length 24,5 km,  the longest road tunnel in the world.
Find more information on: http://www.roadtraffic-technology.com/projects/laerdal-tunnel 

Eiksund Tunnel
Depth below sea level  287 m,  the deepest subsea road tunnel in the world.
Find more information on: http://www.roadtraffic-technology.com/projects/eiksund

Gjøvik Olympic Rock Cavern
Cavern span 61 m,  the widest span in a rock cavern for public use in the world.
Find more information on: http://www.tunnel.no/article.php?id=65