Since introduction of AP I noticed that on some roads the speed limit on the dashboard doesn't show up until a speed limit sign is encountered. Then recently I noticed that sometimes it shows up earlier. For a while I thought that maybe the nav system looks it up in some database, but then I noticed that the speed limit showed up as soon as I passed a sign for the opposite traffic, therefore only viewable in the rear view camera. Combine that with the fact that the car can parallel park in reverse, even sense parallel and perpendicular parking spaces in the read, makes think it may be connected to the MobileEye chip. Does that mean we may get rear car awareness on the IC at some point in the future (showing cars behind, not just in front of the Model S), or is that camera not usable for safety things because it has no wiper and therefore it may be dirty, so anyone relying on checking blinds spots on the IC could cause an accident because of it? Just a thought, if anyone actually knows and is willing to share, that would be interesting to know.