Voice recognition software has a long way to go before it becomes little more than curiosity and I'm not talking about Denso system in particular, but in general, even using much more powerful computers. As far as using navigation system while driving: first of all any meaningful trip into some far away places, where GPS is most useful chances are you would have passenger/navigator as well, also even driving alone it can be done safely if done properly. Some people are much better at multitasking and common sense than others, but of course we only hear about those who are not