NTSB, which makes recommendations but lacks enforcement powers, has previously urged regulators at the NHTSA to investigate Autopilot's limitations, potential for driver misuse and possible safety risks following a series of crashes involving the technology, some of them fatal.

source https://gadgets.ndtv.com/transportation/features/tesla-autopilot-safety-concern-regulator-ntsb-nhtsa-us-elon-musk-2549415#rss-gadgets-all