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I think quietways as originally implemented were just substandard LTNs. I think LTNs are how quietways/mini hollands were originally intended.
I think a basic model is modal filtering to create neighbourhood wide cells and then segregation on the through roads. This requires a level of political ambition and engineering know-how we seem to be sorely lacking.
And the Lee valley route is lovely, though I'd like a little more priority on the signal timings.
The cycle lane along Lee Bridge Road has really highlighted how bad the Quietways program was.
It's really disconcerting as you swap from being a first class citizen, to being sent around the houses on the Quietway through Hackney.
That said - I think Quietways are good supplements for direct routes. Spending tiny amounts of money creating permeable routes between otherwise good roads (especially between LTNs) creates loads of options for local trips.
You have no idea of how much of a barrier an A road (with no cycle crossing) is until you've tried riding it with a child on tow. For example, my wife would kill me if I took our son anywhere near Camberwell New Road on his bike - we can even only cross it at places where it has a signalised crossing, which forces big detours and often requires a bit of walking (or cycling on the pavement).