The transportation agency is reviewing the new robotaxi’s design and compliance with safety standards.

The National Highway Traffic Safety Administration opened an investigation into Elon Musk's Cybercab one day after its launch in Austin, Texas.

Shares of Tesla ( TSLA) were down nearly 7% in recent trading, making it one of the leading decliners in the S&P 500 and Nasdaq on a down day for broader markets. The move erased much of the stock’s gains earlier in the week.

The EV maker hasn’t played by the administration’s own exemption rules, and shown why its robotaxi is better without mirrors, pedals, or a steering wheel.

US regulators has launched an investigation into Tesla's certification of its new Cybercab robotaxi. Can they slow down its expansion?

Tesla is facing a NHTSA audit inquiry into its self-certification for the Cybercab hours after deploying a small number of the robotaxis in Austin.