Actually, studies really show there's no difference between hands-free and hand-held. See e.g. http://www2.potsdam.edu/hansondj/DrivingIssues/20060830105036.htm

Actually, studies really show there's no difference between hands-free and hand-held. See e.g. http://www2.potsdam.edu/hansondj/DrivingIssues/20060830105036.html http://www2.potsdam.edu/hansondj/DrivingIssues/2006083010503... I assume the obvious physical limitation makes at least some drivers more aware that they should keep some focus on the road.