I feel like this should never have to be explained yet, here we are!
This video explains EVERYTHING. There are two types of drivers in this world, one driver gets annoyed that people drive slow in the left lane, and the other driver has no idea what is going on and drives slow in the left lane. It is without a doubt, the most annoying part about driving on the QEII. nothing worse than a semi on the right, and a slow sedan in the left. Watch this video.