Yes, it does. This is the problem with making phone calls while driving. Even if you use a headset to keep your hands free (as is mandatory in many countries), you are still so distracted that you are almost as likely to cause an accident as you would be if you drive while holding a phone in one hand and far more likely than when you chat with another person driving with you in the car.

That is what the article says. This thread raises the issue of cell phone fidelity vs. skype (or land line etc) fidelity being a factor.