Cars are getting smarter and more capable. They're even starting to drive themselves, a little. And they're becoming a cause of concern for European and American safety agencies and groups. They're all for putting better tech on the road, but automakers are selling systems like Tesla’s Autopilot, or Nissan’s Pro Pilot Assist, with the implied promise that they’ll make driving easier and safer, and a new study is the latest to say that may not always be the case.

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