NHTSA initiated the investigation after four crashes involving Tesla vehicles with FSD engaged during low-visibility conditions, such as sun glare, fog, or airborne dust. One of these crashes resulted in a pedestrian fatality, while another involved a reported injury.

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.