3 Heads in the front and Two in the plate area is the way to go. These rear shots are usually quick and they will be aiming at your plate first. Without the 2nd head you might have gotten nailed... Time will tell if you get a ticket in the mail. That was a DragonCam and you need two heads to defeat the DragonCam if they are running the newer firmware. You might have a shot if they are older units.
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