Responding to a user who indicated that Tesla's autopilot function still needs safety tweaking, Musk stated: "It certainly needs to be better & we work to improve it every day, but ideal is enemy of good".
Police in a Salt Lake City suburb say it's not immediately known whether a Tesla Model S sedan's semi-autonomous Autopilot driving system was in use when it rear-ended a truck apparently without braking before impact at approximately 60 miles per hour. "An impact at that speed usually results in severe injury or death", the CEO tweeted.
Earlier, Ron Medford was Deputy Administrator at National Highway Traffic Safety Administration.
The motorist suffered a broken ankle and was taken to a hospital while a firefighter escaped unharmed.
Federal regulators are not investigating the crash of a Tesla electric vehicle this weekend, as Utah police try to determine whether the car's semi-autonomous Autopilot feature was switched on.
In March, a Tesla Model X was on autopilot mode when it collided with a barrier on Highway 101 in Mountain View, Calif., killing the 38-year-old driver.
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"As part of the reorg, we are flattening the management structure to improve communication, combining functions where sensible and trimming activities that are not vital to the success of our mission".
This can lead to the breakdown of the thermal balance of the system and the complete destruction of the batteries and the vehicle.
Mr Schwall was the electric carmaker's main technical contact with United States safety investigators. "To be clear, we will continue to hire rapidly in critical hourly and salaried positions to support the Model 3 production ramp and future product development". Witnesses indicated the Tesla Model S did not brake prior to impact.
Musk said "the probability of an accident with autopilot is just less", and he insisted the vehicle had functioned exactly as it was created to in the California crash. He said Tesla's record of one fatality every 512 million kilometres compared favourably with the 2017 national average of 138 million kilometres, according to safety regulators.
In a Twitter post on Monday, Musk denied a Wall Street Journal report that Tesla had rejected a system that would have tracked driver eye movement when using Autopilot for cost reasons.
Tesla has said that autopilot requires constant vigilance and is not meant to take over driving responsibilities.