[Inyo-Mono]

Watch any movie where people are out and around NYC day or night. You will see steam coming out up opening in the pavement and the sidewalks. Sometimes the steam is so thick it is like billowing clouds.

Now that you mention it, I have seen that in films over the years, I just assumed it was theatrical fog effect to enhance a scene in a movie. I never heard of heated sidewalks before!

[markman46]

ya, even in midwesten cities thye do the same thing