National map of communities with limited evacuation routes

Color Key

Map Key:

Pink areas indicate U.S. communities with limited evacuation routes.
Hover over each area for the town’s population, the number of exits and the main exit “load,” i.e. the percent of daily traffic using the main exit route.

About the map:

Our data science team analyzed the approx. 30,000 towns in the U.S. with populations under 40,000 based on U.S. Census, scoring them using a ratio of the number of roadway “exits” from each town and the average “load” on the most-used exits, weighted by town population. We then selected a subset of approx. 800 communities that scored at least 3 times the average of all towns analyzed. You can download the list, which includes the following detail for the first 100 communities on this list:

— POPULATION, based on U.S. Census
— EXITS, i.e. the number of usable vehicle exits incl. paved and dirt roads
— MAIN EXIT LOAD, i.e. the % of daily traffic using the main exit route

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