Yeah I understand what you're saying but they have done studies on talking on the mobile phone and driving at the same time. The problem is that the findings were really shocking.
They found that talking on the mobile while driving was equaivalent to driving whilst having a blood alcohol concentration of around .25 (that's pretty pissed).
I think the problem is that the people on the other end of the phone aint in the car with you and so don't react to the traffic conditions that you're in. This is why its different from talking to a passenger because they shut-up when/if the situation requires maximum concentration. This, in turn, is why soooo many people bin their cars while they're on the mobile. And I don't know what it's like elsewhere in the world but if you get caught here even with a phone in your hand while driving it's an automatic $300 fine and 3 demerit points.
I happen to think that people who talk on the phone while they're driving are asking for trouble (which they usually get) and I can't say I'm very appreciative of what it is they're doing because they endanger me, as well as themselves.
I'm not having a go at you Eric, I just think it's a serious issue that should be rectified because people do it ALL the time and it's crazy!!!