Walmart has teamed up with automaker Ford and autonomous start-up Argo AI (backed by Ford) to pilot deliveries by autonomous vehicle in several key U.S. markets.

The retail giant, also the largest grocer in the U.S., will offer delivery by driverless vehicle in Washington, D.C.; Miami; and Austin, Texas, using Ford Escape hybrid vehicles outfitted with Argo AI autonomous driving technology. It’s expected to deploy small fleets of the vehicles in each city and plans to grow those services over time.

Testing is expected to begin later this year.