Maybe from the same study... IN addition to citing the advantages of conversing with a situation-aware passenger vs an unaware phone-caller, the study summary a

Maybe from the same study... IN addition to citing the advantages of conversing with a situation-aware passenger vs an unaware phone-caller, the study summary also made much of their finding that there is a significant cognitive load devoted to visualizing the person at the other end of a phone call. This visualization is not needed when the person is in the car. It also mentioned that young children can cause dangerous distractions because they lack the knowledge to know when the driving has gotten tough.