Yes - I agree with the recent research. I used to think differently until I was driving on the M1 and received a couple of calls which involved short discussions. Although I'd made the journey many times before I missed my junction and went on past a major motorway interchange and into the next county before realising the need to turn back! No harm done but it proved to me that hands-free phones DO reduce your concentration. I now switch off my mobile whilst driving and advise others to do so too. Nothing is so important that it can't wait a while.