Department of Transportation/Federal Highway Administration

The Federal Highway Administration (FHWA), cooperating with the U.S. Coast Guard, Federal Railroad Administration, and Office of the Secretary of Transportation, proposed to select, install, and operate a Nationwide Differential Global Positioning System (NDGPS) to augment existing satellite-based GPS range information from a network of ground-based reference stations transmitting from known positions throughout the United States. SRI researched and prepared a programmatic environmental assessment (PEA) using lead and cooperating agency guidelines for implementing the National Environmental Policy Act. This PEA provided support for a finding of no significant impact (FONSI) provided that site-specific analyses were undertaken under prescribed circumstances. The Final PEA was submitted to the FHWA in September of 1999.