DULLES, Va., May 30, 2002 /PRNewswire-FirstCall via COMTEX/ --

- Company's Satellite-Aided Vehicle Management System to Help Improve Cost And On-Time Performance of City's Public Transit Fleet -

Orbital Sciences Corporation (NYSE: ORB) announced today that its Transportation Management Systems division (Orbital TMS) has been selected by the City of Phoenix Transit Department, a Valley Metro member, to supply in-vehicle components and control center software solutions for its new Vehicle Management System (VMS). Valley Metro is the system identity for the 11 Phoenix metro-area transit agencies.

The $22 million contract includes an initial $14.8 million to install system components in approximately 740 fixed-route buses, paratransit and service vehicles, as well as to install the VMS's main software platform in the Phoenix Valley Metro Transit System's operations control center. The contract also provides for $7.2 million in options for system upgrades to include a new cost-effective Motorola radio communications infrastructure solution in support of Valley Metro's short- and long-term operational requirements.

"A sound and efficient Vehicle Management System is very important to the City. Orbital's system will provide us with reliable communications, data messaging, schedule adherence and operational reports that will help improve Valley Metro's customer service and resource management. Useful data for planning, scheduling and maintenance will also serve to improve on-time performance," said Mr. Ed Zuercher, Public Transit Director for the City of Phoenix.

Orbital's system is fully integrated, using real-time, satellite-delivered Global Positioning System (GPS) information, together with pre-programmed fixed route vehicle schedules and two-way mobile communications capabilities to track and manage the day-to-day operations of the Phoenix area's transit vehicle fleet. Under the contract, Orbital TMS will supply its state-of-the- art Mobile Data Terminal (SmartMDT) control unit for approximately 740 vehicles, which the operator will use to communicate with dispatchers, transfer data and monitor vehicle equipment status. Orbital TMS will also install its easy-to-use ORBCAD-NT Computer Aided Dispatch and Automatic Vehicle Location (CAD/AVL) software system in Valley Metro Transit's central dispatch and system control center, allowing system dispatchers to monitor schedule adherence and vehicle status with real-time information.

Mr. David L. Mathisen, Vice President and General Manager of Orbital's TMS division, said, "Orbital TMS is excited to be working with the City of Phoenix in establishing a solid and easily expandable foundation for future system expansion. The improved system will also provide a safer riding experience for both vehicle operators and passengers alike."

About Orbital TMS:

Orbital TMS is the country's leading supplier of satellite-based Automatic Vehicle Location (AVL) systems for the expanding Intelligent Transportation Systems (ITS) market. Orbital's AVL systems are used by 55 public transit and state agency customers in the U.S. and abroad, with units installed, or scheduled for installation, on approximately 25,000 vehicles. Orbital TMS generates annual revenues of approximately $70 million and employs over 200 people at its facility in Columbia, Maryland.

More information about Orbital TMS can be found at http://www.tms-online.com .

About Orbital:

Orbital is one of the world's leading developers and manufacturers of affordable space systems for commercial, civil government and military customers. The company's primary products include low-orbit, geosynchronous and planetary spacecraft for communications, scientific and remote sensing missions; ground- and air-launched rockets that deliver satellites into orbit; and missile defense boosters that are used as target and interceptor vehicles. Orbital also offers space-related technical services to government agencies and develops and builds satellite-based transportation management systems for public transit agencies and private vehicle fleet operators.

    More information about Orbital can be found at http://www.orbital.com .
CONTACT: Barron Beneski, Public and Investor Relations, of Orbital Sciences Corporation, +1-703-406-5528, or Beneski.barron@orbital.com.

                    MAKE YOUR OPINION COUNT -  Click Here
               http://tbutton.prnewswire.com/prn/11690X37782573
SOURCE Orbital Sciences Corporation

CONTACT:          Barron Beneski, Public and Investor Relations, of Orbital
                  Sciences Corporation, +1-703-406-5528, or Beneski.barron@orbital.com

URL:              http://www.orbital.com
http://www.prnewswire.com
Copyright (C) 2002 PR Newswire.  All rights reserved.