Maybe a picture of a dinosaur that says "You too shall pass" ;)

Tried it already, still didn't work in my parts. They have to learn how to read first. Actually, it did work for most people. Just couldn't understand why some people "STILL" insisted in following. A lot of people did think my little Insight was a prototype of some sort and there is a lot of vehicle testing done by Ford/Mazda/Mercedes & Hyundai down here.

That's cool:) . Mine's probably only readable by literate tailgaters, but tailgaters are the ones that need to see it most I guess.

Hi all, new guy here!

Regarding the bumpersticker suggestions, how about:

Support Our Troops So Fat Morons Can Drive SUVs

If You're Close Enough To Read This, Slow Down!

I'm Not In As Big A Hurry As You Are

and the old favorite:

Honk If You're Illiterate (which actually has gotten me quite a few honks around here...maybe they think it means "illegitimate"!)

lol, how about:

Back off or pass (unless you are drafting)