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Not sure how it will work. I'm guessing it takes a photo and most of the time it will be one suspicious looking vehicle hoofing it away from the lights! The guy who told me about it drives track prepped mustangs so he's looking at getting a lot of tickets. His latest one is too loud for most tracks anyway, he's had it measured at +100db. It is needless in that case.
In short I'm sure a quick look at the photo would sort out who's to blame although that might not be prosecutable. I put to you m'lid that it's not the VW Up in the picture that is breaking the sound barrier, it's the Ducati with the Termignoni exhaust!!
Groan. Be interested to know how they're supposed to work in a congested area. How would they differentiate the source?