On my commute to work I've notice that I prefer to ride in the passing lane when on a highway. In my case it's a 3-lane highway with a barrier on the left between the highway holding traffic going the opposite way. I've been doing this on the advice of a friend who said it was the safest place to ride because other drivers can only enter your lane from the right, middle lane. Riding in the middle lane means traffic can merge into yours from the left or right, and riding in the right lane means traffic can merge into yours from the left (middle) lane, or from traffic merging from an on ramp, gas station, commercial store, etc ...
Oddly, when riding at night I prefer the middle lane because my lights can't fully illuminate what's to my side, while cars traveling in the left and right lanes give me the illumination that I need, especially when they approach to pass.
Anyway, I was wondering what others' highway riding strategies were?
-Wolf