For safety reasons some of us like advanced notice when others will be slamming on their brakes to avoid a ticket.
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All of this radar detector talk makes me wonder one thing. Why hasn't anybody come up with a device that detects the radio waves from the police cars and plot them on a map via GPS on a smartphone? Police radios are always broadcasting between 37 and 38MHz over the airwaves. Contrast that to a police radar which is not always powered on. It could accurately judge the distance of a patrol car in accordance with the signal strength the receiver is detecting. Sort of like war driving for police cars.
I use "Beltronics STi Magnum".
Beltronics > *
Awesome user interface. Turn X off. Done deal.
I have an Extra Passport 8500 blue display that I'll sell for $200