Swift Transportation Company is a transportation services company and a truckload carrier in North America. The Company operates in four segments: Truckload, Dedicated, Central Refrigerated and Intermodal. As of December 31, 2013, the Company operated a tractor fleet of approximately 18,000 units comprised of 12,800 tractors driven by company drivers and 5,200 owner-operator tractors, a fleet of 57,300 trailers, and 8,700 intermodal containers from 40 terminals positioned near freight centers and traffic lanes in the United States and Mexico. During the year ended December 31, 2013, its tractors covered 2.1 billion miles for shippers throughout North America. In the Company's trucking operations, it principally operates in short-to-medium-haul traffic lanes around its terminals or dedicated customer locations. In August 2013, the Company announced that it has acquired privately held Central Refrigerated Transportation Inc.