I’ve seen a number of these recently. (Link to Wikipedia in lieu of photos so this’ll post now) https://en.m.wikipedia.org/wiki/Boardwalk
The top photo is what I’m seeing, except often it’s not even elevated, it’s just a wooden path. Though I will say they’re usually a part of trails and not just some random wood. I think people okay them because they are footbridge-y. I reviewed one then saw it in the nearby section for a different review (I’ll admit, I was kinder to that one than others because the photo was amazing).
I’ve been 3*ing these mostly since I haven’t felt like they clearly are or are not eligible. I’ve upped that for some legit nice boardwalks that are actually raised so are arguably bridges. I’ve lowered that for some questionable “that’s just some junk wood on a makeshift path through a neighborhood”.