For kicks I mapped out a route from my house to the office that avoids high traffic roads as much as possible. It wasn't possible to avoid them completely because of a couple of creeks that are only bridged for high traffic roads and the lack of options around where I work, but it's mostly residential. I was surprised to find that it only adds a bit over two miles.

It kind of looks like the result of a fractal generator though. I might give it a try some day.