The fire, which was caused by a crash and saw a fire erupt in one of the battery cells, was not enough of a disaster for the NHTSA to consider it the result of a safety defect.

This was the first case of the Model S having a major fire event in a crash, and with no trend and no reason to believe it was a fault with the vehicle, the NHTSA decided to close the book on this one.

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That's the right move.