After nearly a decade of working on self-driving cars in private, Google is finally ready to take the public for a ride. Its autonomous spin-off, Waymo is adding 500 modified Chrysler Pacifica minivans to the 100 it already has on the roads of Phoenix, Arizona, and has invited locals to sign up for free rides to school, work, soccer practice, or anywhere else they need to go. Waymo likely has the most sophisticated driving tech