You would see the shelter signs pretty frequently, along with their designed occupancy. The approach to this in Manhattan in NYC was beyond farcical. Yes there

You would see the shelter signs pretty frequently, along with their designed occupancy. The approach to this in Manhattan in NYC was beyond farcical. Yes there were shelter signs at various buildings. Presumably their basements would be able to hold a few hundred people each. But consider: 1) what would an H-bomb or two do to Manhattan? 2) if alive, how do several million people survive in Manhattan if there is no water supply? 3) even if there is water, for how long will a few cases of moldy food feed them? 4) what about waste and hygiene? That many people will produce a lot of poop. Does it all stay in the basements if the sewage system isn't functional? 5) etc. As I said, the situation couldn't have been more absurd if it was deliberately written to be a farce. Manhattan wasn't the place to be hunkered down during a nuclear war. The movie Escape From New York depicted a Utopia when compared to what reality would have been. Thankfully we never had to use any of those shelters during a real war.