Driving on the NPS Blue Ridge Parkway near here, there's a spot where my current Tomtom always shows me being well off the road to the right, which would mean I'm inside a large rock face. The road as shown on the screen would have to be hung om air about 500' up. It only lasts for a few hundred feet, but there's also a phantom road that shows as intersecting in the same general area. No such road exists, and there's no place for one to have been.
I've noticed it several times late at night when I'm coming home from stargazing at Craggy Gardens. Hadn't really thought about it until I read this thread. I'm a bit overdue for a doing a map update now, so it may be fixed in their data base.
Jim, "Mo' coffee!"