Tesla driver killed in crash with Autopilot active, NHTSA investigating

A Tesla Model S with the Autopilot system activated was involved in a fatal crash, the first known fatality in a Tesla where Autopilot was active. The company revealed the crash in a blog post and says it informed the National Highway Transportation Safety Administration (NHTSA) of the incident and said NHTSA is investigating.
The accident occurred on a divided highway, when a tractor trailer drove across the highway perpendicular to the Model S. Neither the driver, who is ultimately responsible