The timeline for autonomous cars hitting the road en masse keeps getting closer. GM's Cadillac division expects to produce partially autonomous cars at a large scale by 2015, and the automaker also predicts it will have fully autonomous cars available by the end of the decade. Audi and BMW have also shown self-driving car concepts, with the former working with Stanford to pilot a modified TT up Pikes Peak. Meanwhile, Google is ripping along at its own rapid pace with a fleet of fully autonomous Toyota Prius hybrids that have logged over 300,000 miles.

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