I have an Audi that has both speed limit info and stop light info in the dash. I know for a fact that it uses the camera for the speed limit signs as it will interpret school zone areas. Sometimes it misses the “end school zone” sign or not recognize the yellow border around the school zone begin sign. You can see the display become out of sync with the road conditions until the next speed limit sign appears.

As far as the stop light data, that’s fed into Audi through a select number of state DOTs (mine is one of them). It’s almost magical that it can tell you when the light will turn green.