Sorry for being so off-topic.
I make a point of not being in somebody's blind spot - I'm either behind them, or passing them, and as I pass them, I try to see if I can read the drivers body language to make sure they're not going to come into my lane.
Another thing I try to do, but prolly don't do often enough, is look for a way out of potential situations - what will I do if the guy in front of me (or in front of him) does "this"? What's my best/safest option?