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Second-hand info, but: I've heard humans only take control when the system flags that they're stuck.

Stuck or blocked by some first amendment disorderly protestor type

what I have heard is that they also summon the human operator input at all intersections / crosswalks / traffic signals.

Yes, by offshore teleop pilots from low wage countries. They are still taking local jobs.

Those kinds of robots should never be allowed on sidewalks.

> Aren't they mostly piloted by people?

In which country? People normally consider outsourcing to a cheaper country as taking jobs.