WASHINGTON (Reuters) - The National Highway Traffic Safety Administration raised concerns about Tesla social media posts that suggested its Full Self-Driving software can be used as a robotaxi and do not need driver attention.

NHTSA in October opened an investigation into 2.4 million Tesla vehicles with FSD software after four reported collisions, including a 2023 fatal crash. In a May 14 email made public Friday, NHTSA told Tesla its social media postings could encourage people to see FSD as a robotaxi "rather than a partial automation/driver assist system that requires persistent attention and intermittent intervention by the driver."