There are a lot of tunnels because the great terrain sort of demands them for meeting the surface transport needs of the population in a way that is not the case anywhere else ...... even as the population density in Norway is so very low.

Norway has a lot of road tunnels for its size, the longest road tunnel and a substantial chunk of the twenty longest road tunnels in the world. Some might say that the fascination with the tunnels is not with the tunnels themselves but in what the tunnels signify for and about a place and its people.