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Cheers, great work. I rode along most of Wightman Road today and can only describe the drivers I encountered as courteous and competent, but of course it wasn't operating under heavy pressure today. Very steady flows but nobody got impatient.
What I find very interesting about the findings along Wightman Road is that there doesn't seem to have been a pattern I thought likely--that Turnpike Lane-bound drivers might have turned off Green Lanes after a few streets of the Ladder to scoot over to Wightman Road. That doesn't seem to have happened, with consistent flow reduction figures of 90-95% all the way along Wightman Road. Obviously, it's only a snapshot, but still intriguing.
Where the connection was used between Green Lanes and Wightman Road, it seems to have been the trio of one-way streets that are Allison Road, Hewitt Road, Seymour Road, although there was an overall reduction even there. Motor traffic movements along these three streets are probably related to drivers going to and from St Ann's Road; eastbound via Hewitt Road, and westbound via the Harringay Road one-way system and then into Allison Road, which has much higher flows than surrounding streets, or via Salisbury Road/Warham Road.
I mapped the traffic count that was done during the closure, you can see significant decrease in traffic along the Ladder and Wightman unsurprisingly https://batchgeo.com/map/f6dadd7f35d86d118c8bd3da53fd7f87 https://batchgeo.com/map/dffd78475ca0d105236f9860a0555b49
It looks like it's back to normal now, I rarely ride on it as the combination of aggressive drivers and multiple pinch points is pretty shit (bad enough that most people favour the traffic-filled Green Lanes).
There is a count going on there at the moment to see whether the traffic has returned or not following the closure.
There's no real political will to do anything about it, the priority still seems to be cars. A few years back there was even a proposal to remove the bus lane on Green Lanes to provide more car parking (fortunately vetoed by TFL).