I think they are making it up as they go along, I reported earlier that it is often seen that a busy and delayed bus will be caught up by the next one, particularly in peak times, and I can sort of understand how it can happen, however the other night, when I got to my stop after work there was already a bus there waiting to go. A bit unusual but this sometimes happens, they sometimes start their run from my stop, other ones come by from down the hill and fly by, but never ever running on time or to any schedule that I can find.