Elon Musk says next year's Tesla cars will be able to self-drive 90 percent of the time

Many automakers and suppliers have congealed around 2020 as reasonable guidance for when publicly available cars are capable of running in a substantially autonomous mode, though key features of self-driving cars are coming sooner — GM has promised a hands-free mode for some 2017 models, and Audi has been making the PR tour this year for its "piloted driving" features. Hands-free highway driving is easier to process than rat's nests of traffic- and obstacle-filled surface streets...

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