And, likewise, those coming at you to make a left turn. Or at 2 way stop signs where you're about to cross. Eye contact with a normal driver usually means they see you. Even direct eye contact with a voluntary idiot and you're still probably invisible to them.
I recently finished reading Traffic (Tom Vanderbuilt), and it's quite eye opening. We already don't have the brainpower to drive safely - the brain just takes shortcuts like ignoring things in its visual scope that it doesn't have "abbreviations" for. Talking on a cell phone - hands free or not - takes a good, large chunk of that already overtaxed part of the brain and diverts it. Meaning even things like stop signs, stop lights, motorcycles, and children playing in the street can go completely unseen, even if directly in front of the driver. Even worse, it happens at a level that you have no clue that it's happening. Thus the belief by many that they can still drive safely while talking on a cell phone even when those of us behind them know they're driving like drunken sailors on leave.
I personally think that cell phone records should be part of any crash investigation, and that at-fault determinations should be changed such that if the records show there was a call in progress with a solo driver, that they be held at least 50% at fault.