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I have the speed limit info system in my F10, but the speed limit warning you set in i-drive is quite separate to it and doesn't depend on the speed limit the speed limit info system has captured from the camera/navigation system.
it would make much more sense if the speed limit warning was based on the speed limit the camera system found (eg you are x km/h over the posted limit and you choose what "x" is). They should have made these two parts of the software talk to each other then it would be more useful.
However considering how innacurate the speed limit info system is (accurate about 70% of the time in Finland) then the warnings would not be that reliable (mistakes are made both in over and under estimating the posted speed limit).
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