Signposts are subtle cues that give you orienting information if you know to look for them.

When you're orientated properly, the superposition of possible states collapses into one.

If you don't look at the signpost and know it's important, you won't have your superposition of possibility collapsed.

Metaphorical signposts are way easier to miss than the real kind.

You have to think ahead: if future A were happening instead of future B, what kinds of signposts would I see?

The individual signpost doesn't tell you much when it happens; they update your priors about the state of the world, and thus which of the possible futures become more possible.

Even a somewhat noisy-seeming set of signposts can give you enough information that can snap your understanding of the future into one crystal clear prediction.

Other people will just see noise; you'll see which way the world is pointing.