Sorry its a bad video but I was trying to record on my droid x while driving standard. I had originally passed him and got prom .3 miles of detection when he was facing the other way (had someone pulled over). So I drove past and turned around when I lost the rear signal. I was hoping he'd still have the car pulled over but he moved. Oh well... you can see him pass on the left when I move the camera there. In all it was .6 mile detection.