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this is a key issue rather than bad implementation
inconsistent rate of implementation, its just not enough
if they are implemented borough-wide rather than trials in small pockets it can actually show a positive change which then can be used as a justification to roll out further and more
in London Hackney is leading the way: https://twitter.com/hackneycouncil/status/1431510609820983302
Greenwich, Ealing, RBKC, Westminster are all going backwards.
If the council adopts LTN as policy for the whole borough or city then you don’t have this problem. This sounds hard, but it might turn out to be easier to slip this into a policy document or election manifesto than it is to sell a particular scheme.
In terms of roads that won’t be filtered, the main idea is that these are roads that are chokka anyway. Traffic can’t increase because there’s no capacity. That’s what gets you your reduction in driving.