From my own experience, the I/O is right on. Also it picks up I/O blips really good IMO. Theres been many times i've run into I/O on the Texas highways and if its relatively busy , it will catch a blip up to 2miles(from my own experience-I20 Abilene to Ft.Worth) As said the off axis is complaint, but gives plenty of warning. It didn't take me long to memorize the different chirps.




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