[seizethecheese]

Semi-trucks are generally not allowed in the left lane on the freeway, and the right must be a nightmare of merging for semi-trucks in traffic.

[colejohnson66]

Not to mention that if the right lane is an "exit only" lane, merging a truck over a lane is pretty hard. No one wants to leave enough room. Or when you do leave enough room, some idiot sees that giant opening and moves into it.