1. We don't repair roads, we destroy them!

2. Land of 10,000 potholes.

3. If you can build a better highway, we'd like to see it!

4. Highway numbers go to the highest bidder!

[My favorites from ahajokes.com.]
(1) Young I may be, but even young people are entitled to their opinions.
(2)Attempting to silence me doesn't hurt me, but the silencer.
(3) I must remain true to myself.