US authorities are investigating the first death potentially caused by self-driving technology.
The driver of a Tesla car died in Florida in May after colliding with a lorry.
Under scrutiny is Tesla’s Autopilot feature, which automatically changes lanes and reacts to traffic.
In a statement, Tesla said it appeared the Model S car was unable to recognise "the white side of the tractor trailer against a brightly lit sky" that had driven across the car’s path.
The company said the crash was a "tragic loss".
The collision led to the death of Tesla driver Joshua Brown, 40. The driver of the truck, which was pulling a trailer, was unhurt.
A video on YouTube, which appears to have been posted by Mr Brown, shows a dashboard camera recording of a previous incident, with the car steering to avoid a lorry in the next lane.
He wrote: "Tesla Model S autopilot saved the car autonomously from a side collision from a boom lift truck.
"Hands down the best car I have ever owned and use it to its full extent. It has done many, many amazing things, but this was one of the more interesting things caught on the dashcam."