In this Wednesday, Aug. 24, 2016, photo, truck and automobile traffic mix on Interstate 5, headed north through Fife, Wash., near the Port of Tacoma. The federal government wants to limit how fast trucks, buses and other large vehicles can drive on the nation's highways. A new regulation posted Friday, Aug. 26, would impose the nationwide limit by electronically capping speeds with a device on newly-made U.S. vehicles that weigh more than 26,000 pounds.