I could be wrong, but I don't think the UK has a network of privately owned ANPRs that can create ~complete pictures of people's comings and goings, and that data has effectively zero legal protections whatsoever.
Automated speed cameras are fairly common in the US but are obviously not a surveillance network.
I'm not sure I've ever noticed a single one or had a ticket from any or heard of anyone ever getting a ticket from one. They don't seem common in my experience, or maybe it's just like an east coast thing because I've never lived in that part of the US.
Not a surveillance network you know of. Knowing what we know now, why wouldn’t it be tapped, if they could get away with it?
Well for one, there's not nearly enough of them to be valuable the way that Flock is.
Two, 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.
You see that I haven't heard of the thing that I explicitly mention in the exact comment you just replied to?
In 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.