Let's say you're driving on a two-lane road (that is, one lane in each direction) and you're following a car and you are both coming to an intersection. Just as you approach the intersection, another lane is added and the car in front of you chooses the right turn only lane. You are aiming for the left lane because you are either going straight or turning left.
Let's just say you pull as far forward as you can so the car that was previously in front of you has no choice but to wait until you've cleared the intersection because the right hand car can no longer see the traffic coming from the left.
This is how you avoid waiting your turn in line.
(btw, this makes me crazy.)