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Two U.S. senators are pressing federal safety regulators to investigate potential failures in Tesla’s Full Self-Driving (FSD) system, warning of catastrophic risks at railroad crossings. Senators Ed Markey and Richard Blumenthal raised concerns in a letter to the National Highway Traffic Safety Administration (NHTSA), citing reports of near-collisions where Tesla vehicles allegedly struggled to detect and respond to oncoming trains.
Tesla markets its FSD software as a system capable of handling nearly all driving tasks—from navigation to lane changes and parking—though it still requires driver supervision. The senators cautioned that mistakes at train crossings pose far greater dangers than missed traffic signs or improper lane changes, potentially leading to multi-fatality crashes involving vehicle passengers, train riders, and rail workers.
NHTSA confirmed receipt of the letter and said it is gathering information on such incidents. The agency emphasized that Tesla’s advanced driver-assistance systems only provide support in steering, acceleration, and braking, but drivers must remain in control at all times.
Tesla’s FSD has already been under regulatory scrutiny. In October 2024, NHTSA launched an inquiry into 2.4 million Tesla vehicles after four reported crashes linked to reduced visibility conditions such as sun glare, fog, and airborne dust. One of those crashes in 2023 was fatal. The senators are now urging regulators to impose restrictions, such as limiting FSD use to safe road and weather conditions.
The automaker’s other autonomous features have also come under investigation. In January 2025, NHTSA opened a probe into 2.6 million Teslas following reports of accidents tied to the remote vehicle movement function. Additionally, the agency is reviewing Tesla’s robotaxi program in Austin, Texas, to determine whether employees remotely operate the vehicles.
Tesla did not respond to requests for comment on the senators’ latest concerns.
