"Over the past few years, the term ―all-hazards has appeared in a variety of contexts in many federal documents, including homeland security presidential directives, the National Incident Management System (NIMS), and the National Preparedness Guidelines (NPG). To date, none of these documents has provided a succinct definition for the term ―all hazard that is appropriate for transit agencies. Rather, the term has been used in the general context of planning and preparing for responses to security incidents, natural disasters, and other emergencies. This resource document provides a definition and explanation of all-hazards preparedness for transit agencies that expands on, and is consistent with, the national guidance on all-hazards preparedness presented in the NPG. The expansion of all-hazards preparedness for transit agencies adds safety accidents and criminal activities to the list of emergencies to be considered. More importantly, it includes a higher-level analysis of the results of safety, security, and emergency management assessments to prioritize actions for the integrated and comprehensive control of risks."
United States. Federal Transit Administration: http://transit-safety.fta.dot.gov/