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One of the big issues here is that the right turn from Green Lanes northbound to Seven Sisters road is banned so you get a lot of cars going straight on at the Manor House junction and then turning right across traffic to Woodberry Grove straight away.
I find the pinch point a bit annoying but traffic is normally going slowly enough there that you can get into primary without any issue so no-one tries to squeeze through with you. It would be better without it though.
This crash, in which a motorcyclist lost his life, happened where a pinch point was introduced some years ago that many cyclists and motorcyclists have complained about, even though I was told that it was introduced partly to reduce motorcyclist crashes at this point. I don't know whether that has been achieved, but it's tragic in any event.
https://www.standard.co.uk/news/london/hackney-crash-motorcyclist-dies-in-crash-on-busy-road-in-east-london-a3664851.html
NB 'Woodberry Avenue' in the article should be 'Woodberry Grove'.