A road or railway can impact quite a large area, due to fringe effects. It can cut migration paths. The most valuable nature reserves are the ones that are comp

A road or railway can impact quite a large area, due to fringe effects. It can cut migration paths. The most valuable nature reserves are the ones that are completely untouched, and a long way from any human activity. On the other hand little islands urban forest are just a waste of real estate (and a great source of wild animals on roads). Wildlife "corridors" may be a useless waste of space, or incredibly useful ... I'm not too sure. I guess it depends on how the animals use them. Hopefully won't do too much damage, though. As you say, Alaska is really big.