You can only process one thought at a time. That is how people can endure major pain, by concentrating on something else. The human brain cannot talk and drive at the same time. I do not care who you are or how well you THINK you drive. Many race drivers hate radio talk when racing. It breaks their concentration. The brain processes one thought at a time. NO one and I mean NO ONE can do process 2 thoughts at the same time. So you are really swapping from talking to driving. This is dangerous.