Self-driving cars are getting ready to take the wheel in Nashville. Waymo says it plans to start running fully autonomous vehicles in parts of the city later this month, after more than a year of testing with safety drivers. Metro police leaders recently got an up-close look at the technology, and the company says this is the final step before opening rides to the public through Lyft. Officials stress the service will be limited to certain routes and will follow special protocols when interacting with police and emergency crews.