David Letterman is retiring. Such great memories of watching him over the past thirty-two years!
At my daughter's school it's simply the layout of the school/roads.
The normal speed limit along the road is 45 mph. Way too high any time of day. The front side of the school dead ends with dirt fields in 2 directions. So there is really only one road that all parents have to use to pick up their children. The school changed its end time this year by 30 minutes and there are about 20% more parents because they are now off of work in time to go to the school to pick up their child.