You're a Sign

I drove down I-75 and there was a sign by the side of the freeway encouraging me to drive the speed limit because it saves lives.  You know, one of those signs that they have in front of High Schools that have red lights on a black background, and they announce things in sequence, like:  "Congratulations to Steven Black" and then on the next light-up, "For winning the Spelling Bee." 

The sign on the side of I-75 said:

"I don't speed in your neighborhood."

"Please don't speed in mine."

And I was thinking, "Yeah.  That's cause you're a sign.  Pretty impossible to speed when you're a sign."