[jfb]

I live in Toronto, and the problem is certainly one of traffic density, exacerbated by the heavy use of streetcars on Queen/King &c and the brain-dead payment model. The TTC doesn't schedule buses and streetcars to stack up -- it happens because of traffic holdups. That's not to say that they couldn't schedule better, of course; I think that dynamic scheduling, where buses can for instance skip stops if there's another following within 90sec or some other heuristic to catch up further on the route.