This has happened to me before and, like today, saw the bike coming up on me.
I was riding on the interstate on my way to work when a pair of crotch rockets come up behind me. I always stay to the left side of the lane. They passed on my right in the same lane of travel. No big deal, but I just can't think of this being a safe practice. If I had not seen them and the car on my left drifted, it could have been very ugly when I moved right.
I just cannot imagine doing this without knowing or having knowledge of the other riders experience.
Is my thinking wrong here or am I just being overly cautious?