Abstract
Rapid and accurate information sharing is a critical operational need for coping with threats against public transportation systems. This report offers information on a variety of approaches to improving the sharing of threat information. Current practices, operational needs, technologies for threat information dissemination, and system functional requirements are discussed. Effective strategies for sharing analyzed and unanalyzed reports of suspicious activities and a path to an interoperable set of national, regional, and local threat-information forums are proposed. (Author/publisher)