Do people really think walking under a road sign will give them bad luck?

My final stop when heading home has this huge road sign placed on the pavement, with 2 barriers holding it up. I see all the time people refusing to go under it, so they walk around and sometimes going on the road to get past it.

I’ve googled this and it says because of bad luck, that’s what people think.

Do people really think walking under a road sign/ladder will give them bad luck?

Who decides it? Who also decides what’s a bad luck, when it will happen and how many times?

Is this a case of they’ve heard many people say it so they believe it? But if they heard about this from one person they wouldn’t believe it?

How does it work