I think you're overly optimistic with that estimate -- we'll have "driver assist" cars in 3 - 5 years that can navigate most roads in normal conditions, but wil

I think you're overly optimistic with that estimate -- we'll have "driver assist" cars in 3 - 5 years that can navigate most roads in normal conditions, but will still need the driver to step in from time to time to help with unexpected conditions. 10 - 20 years is more likely for true self-driving cars that can operate completely without human control.