Elon Musk: "I thought the self-driving problem would be hard, but it was harder than I thought. It's not like I thought it would be easy, I thought it would be very hard, but it was actually way harder than even that.
I mean, what it comes down to at the end of the day is to solve self-driving, you basically need to recreate what humans do to drive, which is: humans drive with optical sensors (eyes) and biological neural nets. That's how the entire road system is designed to work,
So for actually for full self-driving to work, we have to recreate that in digital form."