would

[wowenglish1]

I would like to know the meaning of "would" in the next sentence.
These days, you would never see a concert billboard in the U.S. with a cigarette logo on it.

[billmcd]

Among the many uses of "would" is that of probability and in your example ("would never see"), improbability.

[Tdol]

Or more than improbability- in the past, they had such logos, but it is inconceivable now. And wouldn't a cigarette logo be against the law on advertising tobacco in the US?

[Raymott]

I would like to know the meaning of "would" in the next sentence.
These days, you would never see a concert billboard in the U.S. with a cigarette logo on it.

The sentence is true and correct without "would".
"Would" makes it conditional. What is the condition? -
"Even if you could drive down every highway ...
"Even if you really tried ...
"If you ever went to America ...

Sometimes, a sentence is expressed this way to overcome potential objections.

A: "You never see billboard cigarette ads in U.S. any more."
B: "True, but I rarely leave the house / True, but I don't live in America
A: Of course. But I mean 'You never would see them, even if you went out ... / (add the negation of the objection here).