FIGURE S-1 Scale of emergency incident and appropriate level of response.

FIGURE S-1 Scale of emergency incident and appropriate level of response.

(Graphic used with permission of the Maryland Department of Transportation.)

the evacuation, egress, and ingress of people from or to critical locations in times of emergency. Its focus is on transit systems serving the 38 largest urbanized areas in the United States—a proxy for those systems serving populations larger than 1 million. Transit is defined broadly to include bus and rail systems, paratransit and demand-responsive transit, commuter and intercity rail, and ferries, whether publicly operated or privately contracted. Highways and their capacity are considered as well because many transit systems provide only bus service and must share the highways with private vehicles in an emergency evacuation. The study is also focused on major incidents that could necessitate a partial to full evacuation of the central business district (CBD) or other large portion of an urban area. Meeting the surge requirements and coordination demands of such incidents is likely to strain the capacity of any single jurisdiction or transit agency and exceed local resources. (See Figure S-1 for examples of incidents of this scale.)



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement