So setup the Speeding Expression and have some alerts.. The article says it will get the speed from open street maps or what i fill in on the chart... I put my best guess on the fall back chart and set it to 5 mph on the tolerance.. I am seeing a lot of alerts that i don't think are true.. Devices going 63 but the speed limit is 70.. .. I just want to make sure i have this setup right.. Does any USA folks have an example of how they have theirs setup? Can we use google speeds?