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A man who died when his Tesla car, operating in autopilot mode, collided with a truck had previously posted a video on YouTube praising the vehicle's technology. US safety regulators launched an investigation into the fatal accident, the first to involve a Model S operating on autopilot. Tesla said in a blog post on Thursday "neither Autopilot nor the driver noticed the white side of the tractor trailer against a brightly lit sky, so the brake was not applied."