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.

On Friday, the National Highway Traffic Safety Administration said it was reviewing answers given in response to the agency's questions about the safety of its self-driving robotaxi in poor weather among other issues.

Tesla launched its robotaxi service in Austin on Sunday as its Model Y vehicles drove around a select batch of riders who gave rave reviews about smooth, convenient rides that were available for the cheap price of $4.

Tesla’s stock shot higher after Sunday’s launch of the EV maker’s eagerly anticipated — and recently delayed — robotaxi service in Austin, Texas.

Tesla’s robotaxi launch in Austin boosts stock 8%, but early ride footage sparks safety concerns and federal scrutiny over autonomous driving tech.