As I always suspected, making things hands free, doesn’t make things safer. In my opinion, what makes it even more unsafe is that it can be more distracting as you need to learn things that are not something you use elsewhere. It’s not like when you pick up a phone (you do this wherever else you have it), unlike voice activated systems where they’re usually done in a close environment such as a car.
http://arstechnica.com/cars/2014/10/driving-with-voice-activated-infotainment-is-really-distracting-studies-say/