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Mine will occasionally go over the speed limit with the speed limiter on when going down hill....the HUD goes red and (I think) flashes.
The car will brake automatically so it does not exceed the set speed (not the speed limit) when cruise control on.
If you have Driver Assist Plus (or is it Pro?) activated and the speed limiter fully activated (i.e. The button held down until the green tick appears in HUD) the car will slow down, using the brakes if necessary, when entering a new lower speed limit area.
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