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Yet in other places, such as Royal College Street in Camden, they've managed to provide segregation without needing to use the larger road two streets to the West.
There is ample room on the route I mentioned for segregation, it's already achieved by sheer density of cyclists in the rush hour... so really it would merely be formalising the existing use whilst encouraging further use.
Oh well.
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I just looked at your proposed route and completely agree, especially alongside the park, it's a total no-brainer. I wonder if planners just see side road interaction and "cyclist killed by left-turning lorry" headlines flash before their eyes. By that measure (rather than a measure of usability) a long section of totally segregated motorway hugging is the holy grail.
I think the tendency to follow arterial roads might be to do with the practicalities of physically segregating the lane. If you put a segregated lane down a street with a lot of side roads you either have to block them off, or the segregation effectively disappears every 10 meters just when you need it the most.
IANA town planner etc...