This assembly of pictures represents the Eisenhower Tunnel, Colorado, USA
East side entrance ^^^^
West side descent^^^^^^^^
East side entrance^^^^^^^^
The descent into Silverthorne is the west side of the tunnel, the most dangerous part in the winter. Thus the runaway truck ramps. The tunnel provides passage instead of going over Loveland Pass, which we had done in the years before the tunnel was built, in blizzard conditions, not being able to see the car right in front of you.