In many places around here (NH, USA) these power lines are maintained as snow-mobile / Dirt-bike trails. The local clubs often have maps of the lines and great information on the tough spots on these trails that you might have trouble with in a sedan (like all of it) If you have a good 4X4 or a ATV then these are essentially open highways that will not be over congested. The are not much use in an urban area. For urban alternative roadways you might want to consider the rail lines. These also run just about everywhere and are easily accessible. Some of the draw-backs of rail-lines is having to get over to allow a train to pass and the legality of using them. Some of the advantages of rail-lines is that they are guaranteed to go through without obstacles (other than the trains) . If you are going to plan on the rail lines then find out what frequency they communicate on and listen in also get as much scheduling information as you can. Don't go into rail tunnels! There is no way to pass a train in a tunnel!