Three major for-hire carriers and a large private fleet have partnered with autonomous truck developer TuSimple to test the company’s self-driving technologies in real-world operations over the next four years. As part of a plan to build out a geographical network of lanes nationwide, UPS, U.S. Xpress, Penske Truck Leasing and private fleet McLane plan this year to deploy TuSimple’s autonomous truck tech, which is a system that retrofits onto existing trucks.