"Adopt a Highway" sign with a question mark on it?

Hello!

Random question, I brought this up to my boyfriend recently and he had seen it, too, but didn't know what to make of it.

There's one of those signs posted along the highway that says "Adopt-A-Highway : Humming Bird Insurance ?"

There's literally a question mark on the sign. Anyone know why?

I think the location is coming north on Brevard/191 towards the big junction where you can hit 40/26/240 etc, right around a big bend.

Anyone know what's up with this?