(A) A lane used for turning left against oncoming traffic. (b) A traffic lane on the far left-hand side of a highway or freeway, intended for drivers who wish to overtake slower vehicles; a passing lane.

Designating a driver who uses the left lane of a highway or freeway not just for overtaking but for driving at a steady speed at or below the speed limit with the result of impeding traffic flow, as "left-lane bandit", "left-lane driver", "left-lane hog", etc.