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　　according to reports, recently, the US federal government regulators have launched a wider investigation into whether there is a problem with Tesla's electric vehicle's self-driving technology. It is reported that the investigation also listed Tesla's in-vehicle camera system as the subject of the investigation.

　　On Thursday, local time, the National Highway Traffic Safety Administration (NHTSA) released its investigation letter to Tesla. NHTSA asked a series of questions about Tesla's in-car camera system, including how to use the cameras to monitor whether drivers are paying attention.

　　The NHTSA letter was sent to Eddie Gates, Tesla's "Director of Field Quality." Among the questions the agency asked was, please describe the role of in-vehicle cameras in enhancing driver attention and interaction, and how this data is used in in-vehicle information systems.

　　NHTSA also asked Tesla to describe the engineering and safety explanations behind certain design decisions within the system of autonomous driving technologies, including Autopilot.

　　NHTSA's investigation into Tesla's Autopilot system, which began last year, is expanding. The new questions raised this time roughly indicate the specific features and technologies of Tesla's electric vehicles that NHTSA is most concerned about.

　　In the past many years, Tesla has used the names of Autopilot and "Full Self-Driving" to promote assisted driving technology, which has been complained and questioned by some people in the safety industry. With more than a dozen Tesla electric vehicle accidents, NHTSA finally launched a safety investigation into Tesla's self-driving technology, which also means an important change in the attitude of the US federal regulators towards Tesla.

　　Tesla did not comment on the news. Previously, the company had disbanded its media relations department.

　　NHTSA also raised a question for Tesla, that is, if the driver's hand is removed from the steering wheel for a certain period of time, the system will issue a warning sound, and what is the basis for the length of time Tesla set for disengagement. NHTSA also asked Tesla to provide information on the time delay before the driver continues to disengage the steering wheel for a second warning.

　　NHTSA asked Tesla to answer all of the survey's questions by September 19.

　　Separately, the California Department of Motor Vehicles launched an independent investigation into Tesla's marketing practices and whether it falsely advertised its Autopilot system. The DMV said on Thursday that Tesla has filed a defense against the allegations in the investigation.