On August 14, 2009, Knight Transportation, Inc., an Arizona corporation (the "Company"), issued a press release announcing that its Board of Directors has declared a quarterly cash dividend of $0.05 per share of common stock. The dividend is payable to the Company's shareholders of record as of September 4, 2009, and is expected to be paid on September 25, 2009. A copy of the press release is attached to this report as Exhibit 99.

          (d)      Exhibits.

          EXHIBIT
          NUMBER  EXHIBIT DESCRIPTION

            99    Knight Transportation, Inc. press release dated August 14, 2009,
                  announcing quarterly cash dividend

The information contained in this report (including Items 7.01 and 9.01) and the exhibit hereto shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

The information in this report and the exhibit hereto may contain "forward-looking statements" within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. There can be no assurance that future dividends will be declared. The declaration of future dividends is subject to approval of the Board of Directors each quarter after its review of the Company's financial performance and cash needs. Declaration of future dividends is also subject to various risks and uncertainties, including: the Company's cash flow and cash needs; compliance with applicable law; restrictions on the payment of dividends under existing or future financing arrangements; changes in tax laws relating to corporate dividends; and the deterioration in the Company's financial condition or results. Please refer to the last paragraph of the press release and various disclosures by the Company in its press releases, shareholder reports, and filings with the Securities and Exchange Commission for information concerning risks, uncertainties, and other factors that may affect future results.