Tesla faces intensifying NHTSA probe of 'Full Self-Driving' in reduced visibility

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The National Highway Traffic Safety Administration has escalated an investigation into Tesla

’s “Full Self-Driving” systems, according to filings on the agency website out Thursday.

The probe into Tesla’s FSD is looking into possible safety defects that make it risky for drivers to use in fog, glaring sun or other “reduced roadway visibility conditions.”

The investigation, which started last year, involves 3.2 million Tesla vehicles, including Model S, X, 3, Y and Cybertruck EVs that can use the company’s FSD-branded driver assistance systems, according to a filing on the agency’s website.