Tesla’s plan to construct fleets of self-driving vehicles suffered a setback on Friday when the primary federal auto protection regulator mentioned it used to be investigating whether or not the era used to be in charge for 4 collisions, together with person who killed a pedestrian.The regulator, the Nationwide Freeway Transportation Protection Management, mentioned it used to be analyzing whether or not the tool, which Tesla calls supervised complete self-driving, had safeguards in position to require drivers to retake keep watch over in their vehicles in eventualities the self sufficient era may now not take care of by itself.As gross sales of Tesla’s electrical vehicles have slowed, Elon Musk, the corporate’s leader government, has staked the corporate’s long run on tool that permits vehicles to navigate, steer and brake with out human supervision. Final week, the corporate held an tournament on the Warner Bros. studios close to Los Angeles to unveil what it known as a cybercab, which Mr. Musk promised would have the ability to ferry passengers with out a human motive force.However such tool has confronted power complaint from regulators and protection professionals who say it does now not do sufficient to verify drivers stay alert and in a position to take over if the machine makes a mistake. Tesla faces a lot of proceedings from individuals who blame the tool for accidents or deaths of family members.Tesla didn’t reply to a request for remark.The crashes highlighted by way of the security company on Friday came about when highway visibility can have been restricted by way of glare from the solar, fog or mud, the federal protection company mentioned. Tesla’s self-driving tool is determined by cameras to function, in contrast to different producers who additionally use radar or laser era which can be continuously higher at detecting gadgets and other folks when the view is obscured by way of deficient climate or brilliant sunshine.The company mentioned it might “read about the machine’s doable failure to locate and disengage in particular eventualities the place it can not adequately function.”In one of the vital collisions, a pedestrian died. In any other, an individual used to be injured, the company mentioned.The investigation covers 2.4 million Tesla cars, together with vehicles manufactured way back to 2016. All of Tesla’s passenger fashions are concerned, the company mentioned, together with the Type 3 and Fashions S sedans, the Type X and Type Y recreation application cars, and the Cybertruck.Federal officers have additionally been investigating a much less succesful Tesla machine referred to as Autopilot for a number of years. Those investigations won’t live to tell the tale if former President Donald J. Trump is elected subsequent month. Mr. Trump has mentioned he’ll appoint Mr. Musk, considered one of his maximum distinguished supporters within the industry global, to steer a “govt potency fee.”