I'm conflicted about this. On one hand, I'm grateful that the motorist behind is giving me a wide berth (particularly since they're hauling right along), but I'm distressed (to say the least) that these guys are creating what amounts to a dangerous situation.
So: Slow The Hell Down if you're a motorist passing a cyclist. Wait until the road is clear and you can cross over the double-yellow line without endangering anyone. Patience, dammit! And if you're the oncoming guy and see my light, it wouldn't hurt to hug the curb a little.