Vulnerability Assessment of the Transportation Infrastructure Relying on the Global Positioning System [open pdf - 456KB]
This study was mandated by a Presidential Decision Directive and prepared by the John A. Volpe National Transportation Systems Center. In consultation with the Department of Defense (DOD), the study was sponsored to assure the continued safe operation of the U.S. transportation system. All modes of transportation are increasingly reliant on the Global Positioning System (GPS), and according to the study, GPS is susceptible to various forms of interference. This study identified transportation operations that employ GPS, methods for GPS disruption, possible impacts to transportation safety, and approaches to ensure service reliability.