[jcgrillo]

I've noticed that moving right to allow such people to pass on the left (say, in a 3 lane highway) often results in them riding right up behind me, slamming the brakes, and then being blocked out of the left lane. If they were actually driving attentively they would instead merge left and overtake. I suspect what's actually happening is they're playing with their phones, and here in the US drivers sit on the left hand side of the car. So the worst blind spot is when you're merging right. If you're attention-compromised (e.g. because you're constantly checking myspace or tinder or whatever on your phone) then you'll want to spend all your time in the right lane. It's safest that way because nobody can sneak into the blind spot.