Near the town of Gaffney, South Carolina, there is a water tank shaped like a giant peach (Gaffney was once best-known for its peach orchards).
Before the outlet mall was built and people could look at the water tank from the mall, there was a sign on the interstate that said, "To View Peach, Go to Exit 92."
The only highway sign I saw that was nearly as funny was in Griffin, Georgia. It was a crossroads sign with a smaller sign underneath it that read "Bowling Lane." I wondered aloud, "Why do they have a crossroads sign for a bowling alley?" ...
Before I realized that the cross-street was named Bowling Lane.