A motorist on a Massachusetts highway captured a man asleep behind the wheel of his Tesla, presumably in autopilot mode. It’s the latest incident involving semi-autonomous cars that have police and federal safety experts sounding an alarm. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features NBCNews.com, MSNBC.com, TODAY.com, Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news,...
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