TuSimple’s fleet of 40 autonomous trucks has been hauling goods between freight depots in Phoenix, Tucson, Dallas, El Paso, Houston, and San Antonio. These routes are about 95 percent highway, but the trucks can also autonomously handle surface streets, bringing their cargo the entire distance, from depot driveway to depot driveway. Its vehicles join a growing fleet of robotic trucks from competitors such as Aurora, Embark, Locomation, Plus.ai, and even Waymo, the Alphabet spin-off that has long focused on self-driving cars.