Developed vs developing world

Is there a way to differentiate between a “developed” nation and a “developing” nation by asking a single question?

I think yes.

When you want to find out if a particular place belongs to the “developed” category just ask a fairly rich local “What is your preferred mode of travel within the city/town anytime during the day? ”

If the answer is a train or a bus or any other public transport, you know you are in a developed country.

(I guess it is simplistic but more often than not the logic is correct.)