Tesla did not respond to a request for comment.

It has said Autopilot allows vehicles to brake and steer automatically within their lanes but does not make them capable of driving themselves. In June, NHTSA upgraded its defect investigation into 830,000 Tesla vehicles with Autopilot, a required step before it could seek a recall.

(Reporting by David Shepardson; Editing by Dhanya Ann Thoppil)

By David Shepardson