Collections of facts are copyrightable. Which is why you can go out and make a map of your local area but you may not copy the data from google maps. You may end up with the exact same data and that is ok because you both copied the same facts but if there is a mistake on google maps (Perhaps placed as a trap) then you can be caught if your map has the same mistake.
Only the creative aspects of those collections of facts are copyrightable. You can definitively copy from Google Maps, just like Feist could copy from Rural; what you can't copy are the aspects of the maps that require creativity.
As for trap streets, they don't help as much as you think; as we've seen, simply showing that copying occurred is not enough. There was a theory that the trap streets - since they were invented, not facts - could themselves be copyrighted, but in Alexandria Drafting Co. v. Amsterdam, the courts said that copying a few trap streets among a bunch of facts was too minimal to be considered infringement.
