One of the many things I learned in my son’s freshman year of high school had nothing to do with reading, writing or college application résumé-building. I learned the art of the carpool line. Up until this past year, my sons had walked to school right down the street. As a result, I had never sat in an endless line of cars at pickup or drop-off. I had never witness the madness firsthand of late kids, stressed parents and bad driving behavior.