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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.
The human override is done by an employee in a control center, not by the passengers. They can and do override without using the steering wheel, and that's never going to change. The steering wheels are already obsolete, because passengers aren't even allowed to sit up front or touch the wheel.
This is as level 5 as we're ever going to get.
Level 5 cannot have geofencing like this system has.