In the American West, Canada, Russia, and myriad places throughout the world, it's not hard to get three miles away from a road.
It depends on where you are. In a lot of places west of the Mississippi, there are still pretty regular grids, spaced less than three miles apart, of roads. Without them, access for agriculture and ranching would be difficult/impossible.
Plus, even a lot of state and national parks have access roads running through them. You have to go out to places that have no agricultural, industrial or tourism value whatsoever in order to get that far from a road.
It depends on where you are. In a lot of places west of the Mississippi, there are still pretty regular grids, spaced less than three miles apart, of roads. Without them, access for agriculture and ranching would be difficult/impossible.
Plus, even a lot of state and national parks have access roads running through them. You have to go out to places that have no agricultural, industrial or tourism value whatsoever in order to get that far from a road.