self-operating

On one occasion he was caught in the self-operating elevator of the theater and was kept a prisoner in it for over an hour.

They seem to suppose that the social machinery of the world is self-operating.

Malone was not quite certain that he agreed with Burris' idea of a self-operating car, but at least it was something to work on.

But the claim of Evolution is that all came by "resident forces," self-operating.

"It seems to be a self-operating proposition," stated Colonel Wincott.