Walmart said Monday it has started using fully driverless trucking in its online grocery business, aiming to increase capacity and reduce inefficiencies. Walmart and Silicon Valley start-up Gatik said that, since August, they've operated two autonomous box trucks -- without a safety driver -- on a 7-mile loop daily for 12 hours. The Gatik trucks are loaded with online grocery orders from a Walmart fulfillment center called a "dark store." The orders are then taken to a nearby Walmart Neighborhood Market grocery store in Bentonville, Arkansas, where Walmart is headquartered. The program began in December 2020 after getting approval from the Arkansas State Highway Commission.