I learned that the hard way on the autobahn. Stay out of the left lane unless you are cruising at least 140.
I wish people would treat the "fast lane" like what it is actually called... the "overtaking lane".
G. Gordon Liddy summed this all up well... High speed is not really the cause of highway fatalities... it's high differential spee that causes them. I definately think that only about 25% of licensed drivers are worthy to be driving anyways.