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There's a suggestion on Twitter that Google ignores what the council has told them and uses driver behaviour to gauge whether a road is really open or not.
Given it also sends drivers that way and many will trust their phone over silly road signs, there's a long cycle before it gives in and considers the road closed.
I believe it's camera enforced, as it's part time and buses are allowed through.
Update on day 3 of the LTN on Church Street. There seems to be a bit less traffic. Surprising number of cars and vans still going through though.