Google Maps used to license map data from Navteq, and then from TeleAtlas. Recently they switched to their own map data. While that resulted in some improvements, in my neck of the woods they also suddenly included a lot of farm roads, abandoned roads now on private property, and other paths that are not public rights of way. I have reported dozens of these to Google, but some of them still show up in route planning, especially for walking or cycling. It's irritating.