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As I see it, what we call 'cycling infrastructure' is a public realm equivalent of the kind of shit 'foreign' food turned out by British chefs in the 1970s. It understands that other practices exist, but filters them entirely through the lens of our own concept of public spaces.
It will likely never work in London, as a solution, because London does not function in the same way Amsterdam does. This is what frustrates me about the perennial 'BUT HOLLAND THO' argument of some activists. It's not pragmatic and ultimately it distracts attention from the most important issue - that people drive poorly, selfishly and without any sense of responsibility to other road users.
Of course if you can build completely from scratch, as happened in a few og the 50s - 70s new towns, you can build a very high quality entirely segregated network. That's probably closer to Dutch practice, but as I've said above is unlikely to work in London.
It's also very visible. Handy for convincing people that something substantial is happening, when it isn't.