Lazerquest, traffic and other things that go bump in my head

So, today was a typical Saturday, kids off to a Lazerquest party, me rushing them into the car and them groaning, "Aw, mum, we've still got a whole hour, we're gonna be way early again."

And we were.

But time and travel make my head go bump. How on earth does anyone ever co-ordinate travel to arrive at a place on time? If I leave with just the right amount of time planned, I hit a traffic jam and get there twenty minutes late. If I leave twenty minutes early, it's smooth sailing and I get there...