show us the drawing........
and, as for spending five hours, I'd have thought that you'd have done it to convince yourself, if nothing else. To have something to refer to when promoting segregated paths. No? Oh well..........
And there are more arguments against than cost and traffic flows - many more. Reading this thread from the beginning might bring some to your attention, but, supposing that you're too busy wrestling with a 1:1250 scale map here's a few
1. The very streets that most need cyclists are our busy high streets, where there is no room, and no need for cycle paths (see diagram of Islington Green above)
2. Segregation is uncivilised - it inconveniences pedestrians and slices up public space.
3. Nobody, other than a few eccentrics, wants it
I see you're back to the one-way thing. TfL is busy correcting the mistakes of the 1970s and getting rid of one-way streets. They're uncivilised, they increase car speeds, and nobody, other than motorvehicle drivers intent on driving straight through an area, wants them.
The one thing you have to get hold of is this....it's not going to happen. We're going to have calmed areas, home zones, more bus lanes, more buses, more shared surfaces and it's all going to make London an even more wonderful city than it is now - but cycle lanes, they're not happening. And if someone proposes a cycle lane in my neck of the woods I'll be down the Town Hall objecting with the rest of them.