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Very interesting. Can you test and see if it's just relaying the Satnav data or if it's actually picking up speed signs via camera. A lot of cars provide satnav speed info. The problem is that sometimes this might be out of date. If it's the camera, it should give you the info immediately after you've passed the speed sign. Within 1~2 seconds.
I guess the easiest way to test is to keep an eye on it next time you're on a motorway with variable speed signs.
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