Special Cases

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

Picture wikipedia.no

Gjøvik Olympic Rock Cavern

Cavern free span 61 m.  The world's widest span for a public use rock cavern.
Find more information here