On Wednesday  we heard from NTSB Chairman Deborah A.P. Hersman about a recommendation by the U.S. Safety Board for a national ban on cell phone use while driving. The recommendation states that all states should ban cell phone use for drivers.  We got a lot of listener response to the segment.  We asked two listeners to join us on the show to talk about their reactions. Richard Young is a neuroscience professor at Wayne State University School of Medicine in Detroit, Michigan. He has studied cell phone use while driving.