Tesla told U.S. regulators that its answers to questions on the safety of its robotaxi deployment in Texas are confidential business information and should not be made public, according to a letter released on Monday.

While no one was in the driver's seat of the Tesla robotaxis, a front-seat rider acted as a "safety monitor" during the trial.

Years after Elon Musk said owners would be able to rent out their own cars as robotaxis, Tesla begins to roll out a company-owned fleet.