- traffic signals could be optimized for buses,
- more pull outs could be provided for buses so they don't block other traffic when they're loading.
- It might even be possible to build housing in some central district parking areas. That way, more people would be able to walk to work.
As you know, London is one of the largest cities in the world, and most people have pretty distant commutes to work. I doubt if there's any way to make rush hour commutes congestion-free, even if they were carfree.
I read that the big push now is for more bike commutes in London. It will be interesting to see how that pans out. I think that bikes are still in the experimental stage as far as moving massive numbers of commuters in a megacity.
Have Londoners ever tried flexible work hours to reduce peak loads (AKA rush hour traffic)? That might be another experiment that's worth trying.
It's going to be very difficult to change established travel patterns, but clearly this must be accomplished if London and other super cities are going to remain livable.