This is how it works (or at least this is what I've read and my experience confirms it):
1) Speed data is pulled out from the maps in your F10's navi
2) The front camera scans all signs you go around
3) if 1 and 2 match, then data is displayed in your HUD. If they don't you see an empty scratched circle.
I believe this is true, cause here in Bulgaria I get no speed limit info without regard how clear the sign is. I hope that with the 2012 Navi update there will be info about the speed signs, but unfortunately there isn't.
In Germany on the other hand it works flawlessly, knows every single speed sign and will alert accordingly.
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On order - 2017 F15 X5 40d M-sport Individual
Current - 2016 Porsche 991 911 Turbo S w/ Aero Kit
Retired - 2015 F15 X5 50i, Mocha Nappa, M Sport Wheel, Night Vision w/ human recognition, Harman Kardon
Retired - 2011 F10 550i xDrive
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