Google maps has some weird things in it... near my house it goes from winter to summer square to square, and the streets don't exactly line up. I think they try to fuzz it a bit sometimes to make it less obvious.
If you look around Monaco, and try to trace out the F1 track, it gets really fucky where the tunnel is, a whole chunk of the city isn't right.
http://maps.google.com/maps?hl=en&sa...&t=h&z=18&om=1