Waymo is currently testing the truck manually to gather data.

Waymo is in the early stages of building a self-driving semi truck, a spokesperson has confirmed. A company told Buzzfeed News the program is currently limited to just a single truck. Engineers are driving the prototype manually on public roads in order to gather the data they need to move on to the next phase.

"We're taking our eight years of experience in building self-driving hardware and software and conducting a technical exploration into how our technology can integrate into a truck," Waymo said in a statement.

The company didn't specify when it will begin testing the truck's autonomous systems.

Google-owned Waymo isn't the only company in the race to revolutionize the trucking industry. Arch rival Uber made headlines last fall when it delivered a trailer full of Budweiser without a driver. The technology came from a startup named Otto, which is at the center of a bitter lawsuit between the two tech giants.

Embark is quietly developing a self-driving truck, and Tesla's electric semi truck will undoubtedly benefit from the company's Autopilot suite of electronic driving aids. Finally, the United States Army will begin testing autonomous line-haulers in Michigan before the end of the month.