For me if parents are not here by 8:05, they need to meet us where ever we are. Now if the roads are bad or there is an accident of course that changes things. I think that it is very very important that parents respect our time, their childs time, and the other dck's time. Why is it fair to the rest of the group to sit around waiting because Jonny x's dad can't be bothered to show up on time.
I have it in my contract that we leave at 8;00 am for the school run. If you need time to tell me something then you had better get here early so we have time to talk BEFORE we need to leave. Or if it isn't emergent, they can send me a text or call.