This map illustrates the use of ArcMap's Network Analyst
Extension and associated tools. Network Analyst was used to analyze and
determine highway detour routes and evacuation routes for a hypothetical
hazardous material (HAZMAT) incident along I-280 in San Francisco. Buffer
zones were established around the incident site and road blocks were placed on
I-280 and US 101. Census tract data for the San Francisco area was used to
determine the number of affected households and individuals within the 0.5 mile
buffer. An evacuation helicopter landing
site was also selected based on a review of the orthophoto base map imagery.
Network Analyst rendered layers of detour and evacuation routes and provided
turn-by-turn driving directions for each of the routes.
