The Semantics of Slower Traffic - Part 2

In The Semantics of Slower Traffic, I posted about a semantically-challenged sub-set of automobile drivers who have a problem defining the word "slower" - particularly when it comes to the following sign.

I just received an e-mail with this brilliant photo-shopped picture that leaves no room for doubt about which drivers should be in which lanes on an expressway. - Thank you Bro

And here is one more picture to help reinforce the concept.