-The Lærdal tunnel is a masterstroke of tunnel engineering; at 24.5km/15miles long, a major issue would be that it is simply mind-numbingly boring to drive through it, with the likely consequence that drivers' minds drift and accidents result.
To counter this, the tunnel is broken up somewhat by three caves blasted out at regular intervals; these are lit by coloured lights and go a ways towards breaking the monotony.
Still mind-numbingly boring, though.
To give an idea of how prevalent tunnels are in western Norway - going from where I live in Hareid down to where my mother's family comes from, Voss - a 400km/250mi drive - just over 100km/62mi are in tunnels, including the Lærdal tunnel and the Eiksund tunnel, which was until recently the deepest subsea road tunnel in the world at 290m/950ft deep. (Steepest grade: 9.6%. Engine braking is your friend.)
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