Tesla’s Full Self-Driving system is facing an expanded investigation by the National Highway Traffic Safety Administration over its safety during poor road visibility conditions, as previously reported by Reuters . Tesla vehicles with Full Self-Driving (FSD) have a “degradation detection” system that’s supposed to alert drivers to take over when the vehicle’s cameras can’t see the road clearly enough to safely use FSD, like during poor weather. NHTSA’s Office of Defects Investigation (ODI) is