Tesla Autopilot 'partly to blame' for crash

The US National Transportation Safety Board (NTSB) has found that Tesla's Autopilot system was partly to blame for a fatal accident in which a Model S collided with a lorry. Federal investigators say Tesla "lacked understanding" of the semi-autonomous Autopilot's limitations. The NTSB recommended that car manufacturers and regulators take steps to ensure such systems are not misused. It said the collision should never have happened. The crash, in May 2016, led to the death of Tesla driver Joshua Brown, 40.