Domino’s Pizza is to trial using Nuro autonomous delivery robots to deliver pizzas in Houston, Texas.

The small, low-speed delivery robots are similar to those developed by Starship. Nuro has started to move ahead of the crowd by getting a number of regulatory approvals, including from the US federal government to start unmanned delivery services.

The company, led by two ex Google engineers, has lately been valued at $5 billion thanks to a funding round of $500 million.

According to Nuro’s head of partner relations, the Domino’s Pizza deliveries will be rolled out in Houston but are set to be launched in other US cities soon after.

“It’s generally difficult for large companies to hire enough drivers to fill their delivery demand,” Leipold said in an emailed statement to Reuters.

Deliveries by Nuro’s delivery robots have nearly tripled in the last year, thanks to partnerships with Walmart, CVS Health Corp and Kroger.

Houston, the fourth-largest U.S. city, has one of the country’s highest road fatality rates. “Houston’s roadways create challenging scenarios for our technology to work with,” Leipold added.