Knight Transportation Announces Opening of Tulsa, Okla. Service Center

PHOENIX--(BUSINESS WIRE)--May 23, 2006--Knight Transportation Inc. (NYSE: KNX) announced the official opening of its 30th service center. This new service center is located in Tulsa, Okla., and will provide dry van transportation services. The Tulsa center represents the 23rd service center providing dry van services in our growing nationwide network. In addition to the 23 dry van service centers, the network includes three Knight Refrigerated and four Knight Brokerage service centers. Chairman and CEO Kevin Knight had the following comments:

"The new Tulsa center represents the sixth service center initiated in 2006. Such growth and expansion is evidence of the caliber of leadership development underway at our company. As our dry van, temperature controlled, and brokerage service footprint expands, our relationship with our customers strengthens, our ability to provide local service is enhanced, quality driving jobs are created, and opportunity is generated for our developing leaders. With our expansion into each additional market, we further strengthen and build our brand as the premier national carrier, providing local service to the markets we serve."

This press release may contain forward-looking statements that involve risks, assumptions, and uncertainties that are difficult to predict. Statements that constitute forward-looking statements are usually identified by words such as "anticipates," "believes," "estimates," "projects," "expects," "plans," "intends," or similar expressions. These statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Such statements are based upon the current beliefs and expectations of our management and are subject to significant risks and uncertainties. The following factors, among others, could cause actual results to differ materially from those in forward-looking statements: the risks inherent in entering a new regional market, including but not limited to unfamiliarity with pricing and operational issues; the risk that customer relationships may be difficult to obtain or that we may have to reduce rates to gain customer relationships in the new region; and the risks and uncertainties identified from time-to-time in our filings with the Securities and Exchange Commission.