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U.S. to decide soon on GM's request to deploy cars without steering wheels
(www.autoblog.com)
This is a most excellent place for technology news and articles.
Actual answer: waymo and GM both have control centers that can direct the car remotely. I know that in waymo's case they don't actually remote pilot the car, they just override the cars path finding and the car goes down the route the remote operator makes. I'd assume GM does something similar