However, Chief Executive Officer Elon Musk cautioned that drivers should keep holding the steering wheel.
The upgrade to the autopilot will be provided through over-the-air.
Over time there will not be a need to have your hands on the wheel.

The manual says that autosteer is a hands-on feature.
You must keep your hands on the steering wheel at all times.
That will come at some point in the future but … this is still early days.

He said regulators would need data showing that self-driving cars work.
Teslas already on the road will help the autopilot constantly improve and become more reliable, he said.
The whole Tesla fleet acts like a connection.
When one car learns something they all learn it, he said.
As … more people enable autopilot, the information about how to drive is uploaded to the web connection.
Each driver is effectively an expert trainer in how the autopilot should work.
source: www.techworm.net