The National Highway Traffic Safety Administration (NHTSA) is investigating Tesla's Full Self-Driving (FSD) feature in relation to four crashes. The collisions took place in reduced-visibility conditions with either the beta or supervised versions of FSD enabled.

Tesla faces a new investigation by the National Highway Traffic Safety Administration, or NHTSA, concerning issues with its “Full Self-Driving” systems, and whether they are safe to use in fog, glaring sun or other “reduced roadway visibility conditions.