Although driverless technology is still in the very early stages of development, it has developed quickly in the U.S. within the past year. Phoenix, Arizona has been a major testing ground for autonomous vehicles since April 2017. In June, Waymo announced its plans to begin exploring the possibilities of self-driving trucks. So it's only natural for driverless shuttle buses to take over the scene next. Small driverless shuttle vehicles were launched in Las Vegas, Nevada earlier this month. The electric vehicle had an attendant on board, to serve as a supervisor, and carried eight people in a half-mile loop around the Fremont Street Entertainment District.