One afternoon, a retired air force pilot and his family were driving through Texas on a vacation. They pass a road sign. One of the children remarks on the fact that the sign is named after a newspaper comic.

After about five minutes, they pass another sign, which reads, "Golf Road". As soon as they pass it, the man turns to his wife and says he knows what the next sign will say, and that he'll bet her twenty dollars that he's right. She agrees, and they drive on. After passing the next road sign, the wife finds that her husband is right, and hands him twenty dollars.

What did the last sign say and how did the man know?