The National Highway Traffic Safety Administration (NHTSA) has expressed concern over Tesla's false claims about its full-self driving (FSD) software.NHTSA opened an investigation into Tesla's FSD software's performance in reduced visibility conditions.NHTSA identified social media posts and website content that could mislead viewers into thinking FSD is fully autonomous.NHTSA requested Tesla to revise its communication to ensure it aligns with FSD's approved instructions.