Remember Steve Allen's oldie about "you-supply-the-answer,I'll-give-you-the-question"?
(sample answer: "UCLA"; sample question: "What do you see when the smog lifts?")

One of my favorites answers is "9-W".
(Edit: 9-W is a major road up the west side of the Hudson River from NYC to the Catskill Mountains. Indeed
it was the way to get there for summer vacations etc. until the Thruway was built.)

So: What's the question?

(answer in I&A "answers to questions" thread)