When you do more than one thing at a time you aren't paying full and undivided attention to any particular thing -- Duh. We don't need a study to tell us that. Particularly when the study is designed to prove a point out of context. It has actually been proposed to ban cell phone use while walking. If talking on a cell is so distracting as to cause a danger, why don't we ban talking to passengers in a car? Perhaps the government should make a law that cars should only carry one passenger so that we will all be safe. Where will the stupidity stop?