On March 23, 2018, 38-year-old Walter Huang was killed when his Tesla Model X crashed into a freeway divider on Highway 101 near Mountain View, California and proceeded to catch fire – the vehicle’s Autopilot system was engaged at the time.

Since then, Tesla has released two statements (March 27 and 30) to shed more light on the incident, with information extracted from the vehicle’s computer logs. According to the carmaker, the Autopilot system was indeed engaged, but the driver’s hands were not detected on the steering wheel for six seconds prior to the collision.

It added that the system had actively provided several visual and one audible hands-on warnings earlier in the drive, but these were not heeded. Furthermore, it noted the driver had about five seconds and 150 metres of unobstructed view of the concrete divider, but zero action was taken to prevent the crash.

Tesla also said the severe nature of the crash was because the crash attenuator, a highway safety barrier which is designed to reduce the impact into a concrete lane divider, had been crushed in a prior accident without being replaced. It said it had “never seen this level of damage to a Model X in any other crash.”

To reassure the public that the Autopilot system is safe, Tesla said owners have driven pass the same stretch of highway where the incident took place with the system active without incident – about 85,000 times since Autopilot was first rolled out in 2015 and roughly 20,000 times since the beginning of the year. It stated “there are over 200 successful Autopilot trips per day on this exact stretch of road.”

While the information released may be pretty comprehensive, the U.S. National Transport Safety Board (NTSB), which are the government agency responsible for investigations are not pleased about Tesla’s decision to do so.

According to a report by The Washington Post, rules governing investigations state “party participants or their respective organisations must refrain from providing opinions or analysis of the accident outside of the participants in the investigation. Failure to abide by these requirements may lead to removal of a party from the investigation.”

Tesla CEO Elon Musk addressed NTSB’s concerns in a tweet on April 3 recently, saying, “lot of respect for NTSB, but NHTSA (National Highway Traffic Safety Administration) regulates cars, not NTSB, which is an advisory body. Tesla releases critical crash data affecting public safety immediately and always will. To do otherwise would be unsafe.”

The incident has opened up more questions on how to approach the issue of self-driving cars, in the wake of this month’s fatal Uber crash involving a pedestrian and an autonomous car. The death of a Huang is the third involving the Autopilot system, with other cases being Gao Yaning in China and Joshua Brown in Florida. In both cases, the drivers’ Model S had their systems engaged at the time.