[tmnvix]

If you separate vehicle traffic too thoroughly then you essentially just turn roads into walls for everyone that isn't in a vehicle.

I think the idea of optimising vehicle flow in urban areas is folly. It comes at the cost of too many other things.

Here's an example of what I mean. https://maps.app.goo.gl/pati5dBBTnSgxZ1m9 . It shows a road in a built up area that has been optimised to increase vehicle flow to the airport (using a roundabout instead of lights) and the effect that has on someone trying to travel by foot - turning what would be a <1min walk into 30min.