To all dumb drivers, plug this basic program into your dim brains:
10 If you are in the left lane and not passing any cars, then 20
20 Move into the right lane
The left lane is for passing. That is all you need to memorize.
The left lane is not a sightseeing lane. It is not your lane even if you are going exactly the speed limit. It is for fucking passing. If you are not passing anyone, go to the right lane. Stay there. Until you have to pass. Move into the left lane, pass, and then get back into the right lane. Duh.