I've lived in SF and Seattle. In SF, in the old days, you got lots of bunching, and usually on particular lines (like the 6 Parnassus which ran in herds), but these days there is very little of that at all. Might have something to do with computerizing the schedules awhile back, I don't know.
In Seattle the buses have posted times on a schedule at each stop and they pretty much nail it in my experience. If a bus is more than about three minutes late people start looking around and checking their watches.
In Seattle the buses have posted times on a schedule at each stop and they pretty much nail it in my experience. If a bus is more than about three minutes late people start looking around and checking their watches.