Google said early on that they learned people learn to trust the self driving features far too much, and that you can't have a car drive itself perfectly for weeks/months/years and expect the driver to be fully alert and ready to take over at any time.
For that reason, they said they do not consider the technology ready until the human driver does not ever need to take over.
I have always thought that Tesla rolling out their Autopilot features was dangerous for exactly the reasons Google said. It works well enough that a human driver will not be prepared to take over if necessary.
Edit:
After doing some research to try and find the blog where Google says they don't believe Level 3 autonomy (Level 3 means the human driver has to be ready to take over) is safe. Every other major car company apparently has come to the same conclusion, Level 3 gives a false sense of safety and it isn't realistic to expect a human driver to be attentive enough to take over in an emergency.
Tesla claims Auto-pilot is Level 2, but most others think it falls under Level 3.
http://www.theverge.com/2016/4/27/11518826/volvo-tesla-autopilot-autonomous-self-driving-car
For that reason, they said they do not consider the technology ready until the human driver does not ever need to take over.
I have always thought that Tesla rolling out their Autopilot features was dangerous for exactly the reasons Google said. It works well enough that a human driver will not be prepared to take over if necessary.
Edit:
After doing some research to try and find the blog where Google says they don't believe Level 3 autonomy (Level 3 means the human driver has to be ready to take over) is safe. Every other major car company apparently has come to the same conclusion, Level 3 gives a false sense of safety and it isn't realistic to expect a human driver to be attentive enough to take over in an emergency.
Tesla claims Auto-pilot is Level 2, but most others think it falls under Level 3.
http://www.theverge.com/2016/4/27/11518826/volvo-tesla-autopilot-autonomous-self-driving-car
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