Here, sometimes all you get is a shield, or what is called a "reassurance sign":
Also, they usually use ALL CAPS, which are harder to read than Mixed Case.
But there is one road sign here in New York I really like: the airport sign. Here's one that I took a picture of this morning (please disregard finger):
What's so great about this sign? Look at the silhouette of the airplane. Do you see that bump near the nose? You might think that's supposed to be the upper deck on a 747, but it's much too short. No, that is clearly a bubble canopy. And the wing seems to be riding high. No airliner has a high wing and a bubble canopy. No sir, that is definitely a B-47 bomber! They took off the engines and the drop tanks, but that long wing and stubby rudder are unmistakable. I venture to say that the guy who drew up the sign based it on this very photograph:
I've always liked the old B-47. It was one of the Air Force's first jet-propelled heavy bombers, and the first to feature those graceful, highly swept wings. It's not a stretch to say that the experience Boeing got building the B-47 led directly to the modern airliner. And now it's leading you directly to a modern airport, at least in New York.