Driverless taxis from the Waymo company’s fleet of autonomous automobiles are now operating in a 180-square-mile area within the greater Phoenix, Scottsdale and Chandler metro areas, making the company the world’s largest fully autonomous, paid ride-hailing service. Self-driving vehicle technologies and systems have evolved over more than a decade, but there are still challenges to overcome in building public trust in driverless cars. Junfeng Zhao, an assistant professor in The Polytechnic School, part of the Fulton Schools, and founder of the Battery ELectric and Intelligent Vehicle Lab, joins a conversation about Arizona’s growing role as a testing ground for autonomous vehicles.