Kroger Co. is betting driverless cars can speed up the adoption of grocery delivery in the U.S.

The largest U.S. supermarket chain by sales and stores on Thursday said it would work with electric-vehicle startup Nuro Inc. to test what they called the world’s first driverless grocery deliveries.

Kroger and Nuro executives said delivering groceries without drivers—while still years away—would make such services cheaper and easier to introduce in less densely populated parts of the country. Nearly a third of 4,504 adults surveyed by Forrester Analytics earlier this year said they didn’t do more grocery shopping online because of costs including delivery charges.

“We are not trying to be a dollar cheaper than regular delivery. We are trying to be an order of magnitude cheaper,” said Dave Ferguson, who helped lead Google parent Alphabet Inc.’s self-driving vehicle arm before co-founding Mountain View, Calif.-based Nuro in 2016.

The Nuro partnership is the third deal Kroger has made in the past two months that aims to aid in how it sells to customers as competitors Amazon.com Inc. and Walmart Inc. move deeper into online food retail.