Actually, that's a bit harsh. They do know which lane they don't want to be in - and it's the one that they were in for the last couple of minutes. Until a couple of minutes later, at which point they decide that actually they did want to be in the first lane after all.
And of course all of these are last-minute decisions where they suddenly swerve across the road and only bother to indicate once they're half-way through the lane change.
Sigh. Still, I do have working air con in the Alfa, which is more than can be said for when I was taking the bus to work.