PRESS RELEASE

                          KNIGHT TRANSPORTATION, INC.
                  ANNOUNCES ASSET ACQUISITION OF TEXAS CARRIER
                                 MARCH 15, 1999

     Knight  Transportation  Inc.,  a short to  medium  haul  truckload  carrier
headquartered in Phoenix,  Monday announced that it has purchased the assets and
assumed selected liabilities of Action Delivery Service Inc., and its affiliated
company, Action Warehouse Services Inc. ("Action").

     Action  is  a  privately-held   short  to  medium  haul  truckload  carrier
headquartered in Corsicana,  Texas. Action serves customers throughout Texas and
the south central United States with a fleet of 50 tractors and 130 trailers.

     Founded in 1978, Action had operating revenues of approximately  $5,600,000
for the fiscal year ending Dec. 31, 1998. Knight will issue 97,561 shares of its
common stock in exchange for all of the assets of both companies.  Kevin Knight,
Knight's  chief  executive  officer,  stated this  acquisition  will help Knight
expand its existing  service in Texas and  throughout  the south central  United
States.

     Knight's  shares are  traded on the Nasdaq  National  Market.  The  company
transports general commodities,  including consumer goods, packaged food stuffs,
and beverage containers.

     Knight provides truckload carrier service to the Western United States from
its Phoenix headquarters, in the Texas and Louisiana region through its facility
in Katy, Texas, and in the Midwest and on the East Coast through its facility in
Indianapolis, Indiana.

     For the year ended Dec. 31, 1998,  Knight's revenue was  $125,030,245,  net
income was $13,346,142, and assets were $116,958,220.