 "Tesla cars")
U.S. highway safety investigators want to know why Tesla didn't file recall paperwork when it updated Autopilot software so it would do a better job spotting parked emergency vehicles.
In a letter sent to Tesla on Tuesday, the National Highway Traffic Safety Administration told the electric car maker that it has to do a recall if an over-the-internet update mitigates a safety defect.
The agency also ordered Tesla to provide information about its Full Self-Driving software that's being tested on public roads with some owners.
The latest clash provides more evidence of escalating tensions between Tesla and the agency that regulates partially automated driving systems.
In August the agency opened an investigation into Tesla's Autopilot after getting multiple reports of vehicles crashing into emergency vehicles with warning lights flashing that were stopped on highways.
The letter was posted on the NHTSA website early Wednesday.
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