[onedognight]

For example if you find lots of People driving in a consistent manner on what is not already a road on your map then it needs to become one. You can do this ordered by number the number of people per unmapped road segment to have the most effect.

Another example, if you find that everyone drives off the road in a certain area then comes back on a little farther down and that no one drives the intervening segment, then the road probably needs to be adjusted.