"The study area faces distinct challenges due to the variety of vulnerable populations that must be considered in the evacuation process. For example, coastal areas in the region face significant storm surge inundation potential, and many residents are located in low-lying inland areas that are vulnerable to freshwater flooding. Every county in the region has a significant mobile home population, with homes that are highly susceptible to hurricane force winds. Major areas of urban population centers such as Port St. Lucie and West Palm Beach are vulnerable to both flooding and severe hurricane force winds well before a system decays following landfall. The Treasure Coast region must be prepared to evacuate highly vulnerable populations on critical routes, often concurrently with northbound and westbound evacuees from southeast Florida. In this particular region, evacuees will find evacuation difficult due to the impact of evacuees from Monroe, Miami-Dade, and Broward Counties. Even though there is local public shelter capacity and inland hotel/motels available, there are limited route choices to leave the region. During a hurricane evacuation, a significant number of vehicles will have to be moved across the local and regional road network. The quantity of evacuating vehicles will vary depending upon the magnitude of the hurricane, publicity and warnings provided about the storm, and particular behavioral response characteristics of the vulnerable population. In the event of an evacuation, the entry of vehicles onto the road network typically depends on the response of evacuees to an evacuation order or storm advisory."
Treasure Coast Regional Planning Council: http://www.tcrpc.org/