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To answer the second part of your question: You really need to order the car with the "8TH" option code. This is not a "software unlockable" option, and any type of aftermarket retrofit or solution looks improbable.
The reason I say this is because if you look at the windshield from outside of the car, where the mirror is, it says "Connected Drive" and there is a camera lens. This camera (hardware) looks out for and detects the road side speed signs, then uses GPS to verify the speed.. then it is displayed in the instrument panel and (if you have it) the HUD.
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