Two U.S. senators urged safety regulators on Monday to launch a formal probe into Tesla’s “Full Self-Driving” software after an NBC News investigation earlier this month reported complaints from Tesla drivers who said the software sometimes failed to detect oncoming trains at railroad crossings. Sens. Edward Markey, D-Mass., and Richard Blumenthal, D-Conn., issued the request in a letter to the National Highway Traffic Safety Administration (NHTSA), which oversees vehicle safety. They cri

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