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"European regulators explain that the system calculates the posted speed limit by analyzing either data from the navigation system or data sent by the traffic sign recognition technology. If it detects that the driver is speeding it can perform one of four actions: send out a visual or acoustic warning (like a warning message in the instrument cluster or a chime), emit a series of vibrations (likely through the steering wheel), provide haptic feedback through the accelerator pedal, or automatically slow the car down to the posted limit. Carmakers are free to choose how the system they adopt reacts."
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