"Look at factorial math and probabilities of everything that could go wrong, times the number of cars out there," he said. "That's why you have gridlock.
"It's [considered] just completely normal to be ... kind-of paralysed and in traffic. It makes no sense to make people drive cars."
He cited the high death-rate of American teenagers who texted on smartphones while driving as one of the main reasons why people should not be driving.
"In the US right now I think texting and driving kills more teenagers than anything else. Why? They shouldn't be driving. They're going to text. Yes, you can educate them, but in the first place if they weren't driving, they could text all day long, which is what they want to do."
This was where Google's self-driving car could help out, he said.
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