But all other traffic would be stationary!

Take the P4 which runs mainly on secondary roads. I don't think the good folks of Dulwich Village would want most of their high street taken up with bus lanes. I think the problem lies with the controllers - it's forever being turned back halfway through its route, with long waits between buses and then two turn up right behind each other. Surely, they must be able to run it more efficiently.

And I also belive that many of the existing bus lanes are totally redundant - take the one at the Brockley end of Adelaide Avenue - most buses actually move out into the right hand lane, out of the bus lane, to turn right at the junction.