Knight Transportation, Inc. (Knight) is a provider of multiple truckload transportation services, which generally involve the movement of full trailer or container loads of freight from origin to destination for a single customer. The Company operates in two segments: asset-based segment and a non-asset-based segment. Its services include dry van truckload, temperature-controlled truckload, and dedicated truckload services, drayage services between ocean ports or rail ramps and shipping docks, rail intermodal services, and truckload freight brokerage services. Through its asset-based and non-asset-based operations, it is able to transport, or arrange for the transportation of, general commodities for customers throughout the United States and parts of Canada and Mexico. As of December 31, 2011, it operated 3,509 Company-owned tractors with an average age of 1.7 years. It also had under contract 467 tractors owned and operated by independent contractors.