A phenomenon that may not occur elsewhere as frequently as it does in my region is the "clumping" of traffic on the Interstate highways.

Small groups of vehicles, all travelling at about the same speed, form a clump or cluster in which the cars in front are the slowest. Cars behind, in the cluster, have caught up and can't get past to drive at their preferred speed.

THIS WOULD NOT HAPPEN IF THE F***ING A******S WOULD SORT THEMSELVES OUT ACCORDING TO SPEED! YOU'RE SUPPOSED TO BE IN THE RIGHT LANE UNLESS YOU'RE PASSING (or are British, obviously).

Peter.