Grocery store giant Kroger just announced that its autonomous vehicle delivery service is officially going driverless, thanks to a partnership with self-driving car startup Nuro. Earlier this year, the supermarket chain announced it will work with Nuro to launch a driverless delivery service in Scottsdale, Arizona. The program used a fleet of Toyota Priuses, equipped with sensors and AI equipment, and staffed by safety drivers. Now Nuro is confident enough to fulfill orders without the human driver. According to a blog post, the company has been working on perfecting the design of an "unmanned on-road vehicle" called the R1.