School kid pick up express:
"So what I thought of is a transponder for each family. When we arrive at the school driveway, our ID and our kid(s) name(s) are displayed on a message board, in the order in which we arrived. Also, a pager attached to the child's shirt would beep, vibrate, and, optionally, pound the oblivious nincompoop on the noggin with a mallet, shouting "Your ride's here, you meathead!" (OK, not the mallet, but the verbal message would be good)."
Perhaps our inventor friends could have a look on here before along with their patent searches to see if a similar product already exists. At the very least it is good for a laugh.