I just took a road trip through eastern Canada and to make speed limit compliance easier I switched the touchscreen from miles to kilometers. Everything worked fine except that Autopilot continuously misread the speed limit signs. The speed limit that appeared on the instrument panel was always much higher than what the signs said (e.g. 160kph). I didn't do the calculation, but I suspect Autopilot was reading the signs as mph and then converting to kph. Did I neglect to change a setting somewhere or is this a bug?