Quote:
Originally Posted by NewM3driver
My portable garmin does that. It knows the speed limits of the road based on gps and shows you the posted limit and then your speed right next to it. If you are driving legal the speed you are going is shown in green, but go over by one mile and it is red. It works perfectly and is actually useful, but the damn display is always RED.
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The BMW one uses the camera to recognize the signs - so it works if they change the signs, or in temporary/work zones as well. I've used something similar in a Navigon app before and it was annoying - it had the wrong speed limit for I10, so I had to turn it's warnings off.