U.S. regulators are circling after Tesla’s Robotaxi launch included unexpected behavior and potentially broken traffic laws

• Tesla’s Robotaxi launch event in Austin on Sunday got rave reviews from analysts, but also led to several attendees posting videos of Tesla vehicles behaving unexpectedly. The National Highway Traffic Safety Administration reached out a day later, and said it “will take any necessary actions to protect road safety.”

The National Highway Traffic Safety Administration (NHTSA) contacted Tesla a day after its Sunday Robotaxi launch after videos online showed the company’s autonomous...