DETROIT (AP) — The U.S. government’s road safety agency is investigating Tesla’s “Full Self-Driving” system after getting reports of crashes in low-visibility conditions, including one that killed a pedestrian. The National Highway Traffic Safety Administration says in documents that it opened the probe on Thursday with the company reporting four crashes after Teslas entered areas of low visibility including sun glare, fog and airborne dust. The agency said that in addition to the pedestrian’s death, another crash involved an injury.