Google parent Alphabet's Waymo is starting trials to ferry shoppers to Walmart stores in Phoenix, Arizona. Walmart shoppers in Phoenix metropolitan area can order groceries on Walmart.com and as their order is being prepared at the store, self-driving cars will transport them to the store and bring them back, Waymo said. 'Riders spend a significant portion of time each week running errands and shopping,' the firm said. Later this week, Walmart and Waymo will launch a test pilot that gives early riders savings on groceries each week when they are ordered on Walmart.com. While orders are being prepared at the store, Waymo vehicles will transport the rider to and from Walmart to collect their groceries.