Federal safety investigators have sent Tesla a detailed list of questions on its upcoming robotaxi service as part of an investigation into how the

U.S. auto safety investigators asked Tesla to answer questions on its plans to launch a paid robotaxi service in Austin, Texas, in June, in order to assess how the electric vehicle maker's cars with full self-driving technology will perform in poor weather.

Tesla's plan to launch fully-automated taxis in Austin by June has drawn the attention of federal safety officials.