Walmart Inc. will pilot an autonomous driving grocery delivery service in Houston in partnership with robotics startup Nuro Inc., according to a Dec. 10 release.

The company had previously partnered with Ford Motor Co. and self-driving vehicle startup Udelv to test driverless deliveries of groceries and other consumer goods in Miami-Dade, Fla. and Surprise, Ariz., respectively.

According to Tom Ward, senior vice president of digital operations for Walmart U.S., the company's online grocery footprint has expanded to almost 3,100 pickup locations with deliveries sourced from over 1,600 stores.

"We've been test-driving a number of different options for getting groceries from our stores to our customers' front doors through self-driving technology. We believe this technology is a natural extension of our grocery pickup and delivery service and our goal of making every day a little easier for customers," Ward said.