DULLES, Va., Apr 29, 2002 /PRNewswire-FirstCall via COMTEX/ --

- Company's Integrated GPS Satellite Positioning and Software System to Help Manage Fleet of 2,400 Public Transit and Service Vehicles -

Orbital Sciences Corporation (NYSE: ORB) announced today that it has been selected by Motorola's Commercial, Government and Industrial Solutions Sector to supply in-vehicle components and control center software solutions for the Los Angeles County Metropolitan Transportation Authority's (LACMTA) new Advanced Transportation Management System (ATMS). Motorola will oversee the installation and start-up of an integrated wireless communications system that will provide real-time information to LACMTA's dispatchers and system planners. The fleet of "Smart Buses" is expected to begin entering service in the summer of 2003.

Orbital's Transportation Management Systems (TMS) division, located in Columbia, Maryland, will supply its state-of-the-art Mobile Data Terminal (SmartMDT) control unit for more than 2,400 fixed-route buses and service vehicles. Orbital will also install its flexible, easy-to-use ORBCAD-NT communications and dispatch software system in LACMTA's Operations Control Center. The ORBCAD-NT system is designed to improve LACMTA's efficiency in managing and controlling its bus and service vehicle fleet.

"The ATMS offers LACMTA the potential to realize service improvements, increased efficiency, reduced operational costs and enhanced safety by providing the agency with more comprehensive, accurate and detailed data for routine analysis," said LACMTA Deputy CEO John Catoe.

Speaking for Orbital, Mr. David L. Mathisen, Vice President and General Manager of the TMS division, said, "Orbital TMS is proud to count six of the nine largest U.S. transit authorities as our customers. We are excited to be teaming with Motorola on this effort and welcome the opportunity to work with LACMTA in helping provide the riding public of Los Angeles a safe and efficient transit system.

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, Beneski.barron@orbital.com.

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SOURCE Orbital Sciences Corporation

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

URL:              http://www.orbital.com
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