I don't want to hijack the thread -- I've lived in the same house for 21 years -- not many people do that any more. There is an intersection near my house that is an old two-lane road crossing a major six-lane feeder. I'm often on the two lane road to get across. At rush hour, the cars back up such that only so many get through before the light turns red, and folks so many cars back and more, move up but have to wait another cycle. I have an odd perspective of keeping track over those 21 years how far back I could be and still make the light. Over that time, cell phone use went from uncommon to ubiquitous, and there is a strong correlation between that and the reduction in the number of cars that get through that light. And it's like any statistics -- I can't tell who, but when I'm in the back of the line there is a high probability that three drivers in the string in front of me will have noticeable delays in moving after the car in front of them has moved, and I'm back there Grrrrrrrrrr