It is very good UX how escalators slow down when nobodies on them but keep moving.
![](https://lemmy.world/pictrs/image/5170ed37-415d-42be-a3e7-3edd79eda681.png)
It makes it clear the direction of movement and how the user has to position themselves so they can ride it without thinking about it- but it saves power from slowing down
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Photoelectric barrier at the entrance for acceleration and a timer to slow it down.
Escalators are more advanced than I'd realized.
So THAT’S what that’s for.