left lane lag 

a condition on limited-access high-capacity arterial roadways aka freeways where a disproportionately large convoy of vehicles occupies the "number one" aka left-most lane in anticipation of passing sauntering traffic in the other lanes. The cause of the build-up is often a beltway bitch or a motorist who is passing other slower motorists at a marginally higher velocity, often less than 1 mph greater, often out of fear that s/he may be pulled over for speeding if s/he goes any faster. Warning: this condition often creates freeway fags.

This left lane lag is ridiculous. That Buick needs to move over and let us pass!

left lane lag by Driving School April 7, 2009