The Norwegian city of Tromsø has just 70k people, and a whole network of underground tunnels with two roundabouts. It's very useful given the weather, and less

The Norwegian city of Tromsø has just 70k people, and a whole network of underground tunnels with two roundabouts. It's very useful given the weather, and less destructive to the island than new overland thoroughfares would have been. If that had been a failure, I'm not sure why it would be repeated.