Originally Posted by doyle
How would it differentiate between a pass and two vehicles or riders following each other? Closing speed?
That's my approach. Anything less than say 5 or 10 mph CLOSING speed is just close racing, so no automatic warning would be given, only manual (push the button) warning if desired. Plus other automatic "smart" stuff, like indicating if the warning is coming from ahead or behind, so you know to either move over for what's coming quickly from behind, or watch out for what's ahead.