 Aurora Innovation Inc. will collaborate with U.S. Xpress Enterprises Inc. to sift the best lanes for driverless trucking as Aurora fine-tunes its system for commercialization. Working with U.S. Xpress NYSE: USX is interesting because the Chattanooga, Tennessee-based carrier has deep ties with rival TuSimple Holdings as an investor, adviser and likely customer for International LT Class 8 tractors that TuSimple NASDAQ: TSP is developing with Navistar. 