The National Highway Traffic Safety Administration said it was looking into what Elon Musk’s electric car company called the full self-driving system.

The U.S. government’s road safety agency opened an investigation on Thursday about Tesla’s “Full Self-Driving” system after reports of crashes in low-visibility. The National Highway Transit Safety Administration said it will look into the Full Self-Driving’s ability to “detect and respond appropriately to reduced roadway visibility conditions,

The “Full Self-Driving” recalls arrived after a three-year investigation into Tesla’s less-sophisticated Autopilot system crashing into emergency and other vehicles parked on highways, many with warning lights flashing.