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The reason why that wasn't a good scheme was because it was implemented in isolation. You can't address a speeding problem like the one in Drayton Park, with its odd character mixture of cell boundary street and non-cell boundary street (as in, a street around a filtered area), by just plonking something into it in one place. It needs a review of the layout of the whole street, associated modal filtering in side streets, and in this particular case, I think, some ideas as to what to do with the area around the station in particular, as that's where the street changes character the most, to look as if it is somewhere much further out and much less built up, before you go round the corner and you're back in London. I think it's the look of that bend that causes the worst problems of driver behaviour. None of this is to excuse the drivers who drove like idiots there, but it still wasn't a good scheme.
There was this traffic calming bit on Drayton Park (20mph zone) that got removed because cars kept driving into it and flipping over. The solution was obviously to remove the traffic calming rather than cars not driving into it.
https://www.islingtongazette.co.uk/news/another-car-flips-over-at-dangerous-drayton-park-road-layout-1-1983354