lane changers (6) wouldn’t have to change lanes so much if everyone drove in the CORRECT lane (keep RIGHT except to pass).
Maybe some wouldn't, but some (or is it many?) will weave in traffic for sport.
This morning a guy in a Mustang cut in between two cars that were maybe 10 feet apart (with the trailing car in the slow lane, one right of the leading car) so that he could...well, I don't know. He had three clear lanes to his left and all traffic was running around 70.