Well for one, there's not nearly enough of them to be valuable the way that Flock is.
replyTwo, they're pointed exclusively at roads.
Three, their outputs don't show up in court cases as evidence, which itself dramatically reduces the danger (even if they potentially could maybe support parallel construction)
Speed and stop cameras are very very good and should be virtually everywhere with extremely strict control on their outputs.
I see you haven’t heard of parallel construction.
replyYou see that I haven't heard of the thing that I explicitly mention in the exact comment you just replied to?
replyIn any case, an evidence modality that can only be used via parallel construction is still far, far, far less risky than one that can be freely introduced in court.