Plus.ai has completed what it claims is the first coast-to-coast commercial freight run with an autonomous truck — carrying a load of Land O’Lakes butter more than 2,800 miles.

The startup completed the hub-to-hub trip from Tulare, California, to Quakertown, Pennsylvania, in less than three days. Not only is this the first cross-country self-driving truck trip, but it was also the first SAE Level 4 commercial pilot haul over such a long distance, hauling a fully-loaded refrigerated trailer of perishable cargo.

The autonomous truck was equipped with a driving system that uses multimodal sensor fusion, deep learning visual algorithms and simultaneous location and mapping (SLAM) technologies.

During the cross-country run, the system was able to handle a wide range of weather and road conditions across interstate 15 and interstate 70 while passing through varied terrains. During the trip, a safety driver was onboard at all times in case manual control was needed and a safety engineer was present to monitor system operations.

The terrain passed by the self-driving truck included the plains of Kansas, the winding roads of the Rockies, road construction, multi-mile tunnels, over 11,000 ft elevations and rainy and snowy roads in the Eastern U.S.

“This cross-country freight run with Land O’Lakes shows the safety, efficiency and maturity of our autonomous trucks, which are already delivering freight for other partners several days a week,” said Shawn Kerrigan, COO and co-founder of Plus.ai, in a statement. “Continued advances in our autonomous trucks will make it possible for these quick cross-country runs to be the norm in the future.”

Plus.ai is just one of numerous startups experimenting with self-driving trucks in the U.S. Kodiak Robotics and TuSimple. But it is not just startups vying for the next generation of logistics. The majority of big trucking companies have also come on-board with the technology including Daimler and Volvo.