Tuesday’s criticism of U.S. National Transportation Safety Board was doubled by the U.S. Head of the Board Tesla’sDriver-assist system after several fatal accidents in the recent past, calling company’s usage of Full Self-Driving for its new systems “misleading.”

These comments follow a day in which Jennifer Homendy, NTSB Chairwoman, wrote a letter to Tesla CEO Elon MuskConcerned about the failure to follow up on recommendations made by safety watchdogs four years back to reduce the system’s functionality, and establish more rigorous safeguards for driver disengagement.

Homendy stated that “it’s obvious that if something is being sold as fully self-driving but it’s not,” people will misuse the technology and vehicles. “Squawk Box.”“And that includes how you talk about technology. You can’t fully self-drive. It is misleading.

Homendy stated that Tesla had not yet responded to safety guidelines from the NTSB. Although she denied meeting Musk, she said that she visited Tesla’s California facility and was able to drive in the Autopilot vehicle provided by Tesla.

Tesla’s stock price has not been affected by this letter nor any other safety investigations into Tesla accidents that were conducted by the National Highway Traffic Safety Administration. Tesla’s stock price hit an all-time high on Monday. $1 trillion.Closed Monday, the stock was up 12.66% to $1.024 per share

Homendy stated Tuesday that the NTSB has 10 ongoing investigations into Tesla crashes and fires. She said that three to four of these investigations are currently open.

The U.S. marketing for Tesla’s driver assist systems is Autopilot, Full Self Driving and FSD Beta. Tesla doesn’t make self-driving vehicles, so the owners manual warns Tesla drivers to “keep your hands on the wheel” and be ready to assume control at all times.

Tesla claims Full Self Driving will allow it to move in or out of a spot, change lanes, use the highway navigation system, and make other autonomous driving decisions. FSD Beta allows drivers to try out an unfinished feature called “autosteer in city streets”, which allows them to navigate through urban areas without having to move the steering wheel.

Homendy indicated Tuesday, “My greatest concern is Tesla’s rollout of full self-driving tech in beta on city streets and with untrained driver. They haven’t addressed our recommendations which we issued as a consequence of many investigations into Tesla crashes.”

Homendy’s comments follow Tesla’s recent update called Full Self-Driving Beta V.10.3 over the weekend. scrambled to revise it after its initial release.

NTSB doesn’t have the same regulatory power as National Highway Traffic Safety Administration. This federal independent agency is charged by Congress to investigate civil aviation accidents in America and major accidents in other transportation modes, such as auto. The agency then suggests actions that companies can take to prevent future accidents.

— CNBC’s Lora KolodnyContributed to the report.