I read with interest the Column by Aaron Povoledo and subsequent response from Randy Pobst.  I tried to find a link to copy, but couldn't.

To quote Pobst in part "....the passing car must get into your peripheral vision at or soon after the turn-in point.  This means the passer's nose must be to about the steering wheel of the car he's overtaking.  If he is only at the  rear wheel, he cannot be seen with-out the mirror, and no one should be looking in the rear-view mirror at turn-in....if the passing car can only make the rear wheel of the car in front, the driver of the trailing car must continue braking and allow the lead car room to take the line.....the overtaking car must earn the pass by taking the line away, which means getting far enough in to reach the line first in order to take the lead"

I agree with him 100%.  When initiating a turn in point, I'm always trying to check my mirrors for dive-bombers, instead of concentrating on the turn proper.

I forgot to add, with apologies to Adam Redavid, Bryan Hellvang, Tom Davies, David Stenner, and maybe a few others, that I've been guilty in this department!

Good point about the vision thing.. Being a noob, I just recently realized that if, while overtaking, I give the overtaken car too much room (meaning if I don't get as close to his side as I safely can), I'm staying out of his field of view as well. He definitely won't see me in his mirrors if I'm more than a couple feet away and the farther away, the less chance he'll notice me in the peripheral vision..

I remember this being mentioned at driver training, but I had assumed it was more of a competitive advantage thing (better line into the corner + preventing the overtaken car from taking his normal line) rather than a safety concern.

I'm sure this is all obvious stuff, but while we're at it...