Except Mike.. My telephone conversations while driving are blasting through my car stereo. Entirely hands free, so I don't need to think. I can dial a call by pressing a single button, I can hang up.
So you guys never think about something else, eat, drink (non-alcohol), listen to music, sing the music, or use your phone while driving? You just focus on the road? Doesn't it get boring?
Either you guys are over-exaggerating or are just insanely paranoid.
People are different, and for some multitasking is not a problem at all, but the general mass is bad at it. Also many people forget or misjudge their own abilities, and that is what's creating most accidents - misjudging of own abilities and limits.
Now, I am not pointing fingers and tells anyone they canot multitask, but when operating an vehicle driving should be primary. Even if it might just slow you down 0.1 seconds in reaction time speaking in the phone when driving, those 0.1 seconds can be the difference on life and death for you or others.
If there is need for an urgent call or SMS that canot wait til you reach your destination, find a safespot / restspot to stop on and do it, don't try our your luck by getting cocky.
I can sing while driving but can't read anything, casual chatter is okay but anything that requires intense thought process while i am trying to navigate the maze that is Hong Kong's road is no no, not like it is dangerous but certainly can distract me enough to miss a junction, and missing junction here is baddddddddd, I have more than once accidentally trapped in a traffic jam that I have no business with.