London cycling Crossrail

Does anyone know the rational for putting both direction of bike lanes on one side and not one lane on each side of the carriageway? I heard it was something to do with minimizing the reduction in capacity at junctions, but I don't understand how that works - anyone? @Oliver Schick?

You won't need 2 dividers so the road/pavement/other can be 1/2 foot wider. Also if you have a toucan crossing every few 100 yards and it's normal for the sequence to allow crossing peds and bikes then it's not slowing traffic? Not a planner or anthing but I guess it could work that way. The alternative which I guess has advanced stop boxes would slow traffic as it stops behind bikes.