Print DETROIT—The Alliance for Automotive Innovation has unveiled several safety principles related to driver monitoring in vehicles with driver-assist systems as part of a public statement by major U.S. auto makers to ensure the technologies are safely and effectively used. The principles focus on effective ways to determine appropriate driver engagement while educating the public on the benefits and limitations of driver-assist features. The auto trade association's effort to address driver monitoring comes after reports of Tesla vehicle crashes around the country—some of which have involved the electric vehicle maker's Autopilot driver-assist system. U.S. safety regulators at NHTSA have investigated 28 Tesla crashes to date—24 of those cases remain active.