How will RoboCars work, and when will we have RoboCar’s?

The RoboCar vision offers huge gains in accident rates, erasing traffic congestion and more, but is it pie in the sky or will we actually have self-driving robotic cars roaming our cities in the future? Today Google’s Self-Driving car project does have modified Toyota Prius’s roaming the streets, primarily in Silicon Valley, prototyping the RoboCar’s of the future.
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