Federal regulators are tightening their oversight of car crashes that involve advanced driver-assistance or automated-driving features, a shift that follows growing concern over the role that systems such as Tesla Inc.'s Autopilot have had in crashes. The National Highway Traffic Safety Administration said in a new order on Tuesday that companies must report serious crashes involving driver-assistance and automated-driving systems to authorities within a day of learning about them. Manufacturers and operators will also have to issue broader monthly reports about their vehicles' safety. "Gathering data will help instill public confidence that the federal government is closely overseeing the safety of automated vehicles," NHTSA Acting Administrator Steven Cliff said. The data will help investigators track patterns in automated-driving crashes, the agency said.