Lærdal in Norway has the world's longest road tunnel. It runs 15.2 miles (24.5 kilometers) through a mountain range.
Boring through the rock is only half the job.
Someone still has to sit behind the wheel.
A long drive underground strains the mind. So the design does more than carry cars. It breaks the sameness of the road.
How do you interrupt a corridor that long?
The route is split into four sections by three huge, lit caverns cut into the mountain. They sit about 3.7 miles (6 kilometers) apart and include parking areas.
The whole run is as long as 269 American football fields laid end to end.
It opened in November 2000 and completed the main road connection between Oslo and Bergen. Cars can travel between the cities without taking ferries or making difficult mountain crossings in winter.
The record is miles of rock cut open.
The fix for the driver is a break in the monotony.
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