The current NHTSA investigation of Autopilot in effect reopens the question of whether the technology is safe. It represents the latest significant challenge for Elon Musk, the Tesla chief executive whose advocacy of driverless cars has helped his company become the world’s most valuable automaker…

Musk has said a Tesla with eight cameras will be far safer than human drivers. But the camera technology is affected by darkness and sun glare as well as inclement weather conditions such as heavy rain, snow and fog, experts and industry executives say.

“Today’s computer vision is far from perfect and will be for the foreseeable future,” said Raj Rajkumar, a professor of electrical and computer engineering at Carnegie Mellon University.
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