Google's spin-off company Waymo has hired AutoNation, America's largest auto retailer, to maintain and repair its fleeting of driverless vehicles around the country, AutoNation said in a press release. That represents a very positive step for Waymo toward its driverless car and possible ride-sharing launch. "AutoNation will help assure that Waymo vehicles are always in top condition as we bring fully self-driving cars to the public," Waymo CEO John Krafcik said. Once Waymo ditches drivers, its autonomous Chrysler Pacifica minivans can operate nearly constantly, day and night, so the cars will need to be mechanically perfect or the results could be catastrophic. "These vehicles need to be in service for hundreds of thousands of miles, much more than personal-use vehicles, to make them economically viable," said AutoNation CEO Michael J. Jackson.