United States Department of Transportation
i
Geospatial Model for Identifying Transportation Service Availability Gaps for Florida’s Vulnerable Populations
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2018-08-01
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[PDF-6.47 MB]
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Edition:February 2017 – August 2018
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Abstract:Currently, there are limited transportation options for Florida’s vulnerable populations, such as older adults, individuals with disabilities, and low-income populations. To determine and communicate comprehensive transportation service gaps to policy makers, the evaluation of transportation accessibility including all possible transportation options for those populations is crucial. Thus, this research aims to develop a geospatial model for identifying transportation service gaps by using a comprehensive approach. Based on the results of reviewing existing methods to identify transportation gaps and categorization of transportation service providers, the team developed a GIS model which takes a supply-demand approach using Alachua County data. Transportation supply for vulnerable populations is measured by quantifying the transportation accessibility based on the gravity model and three route types, including fixed route, flexible route, and door-to-door. Transportation demand is computed by calculating the volume of the vulnerable population. The spatial gaps are found by identifying spatial differences between transportation supply and demand using a supply-demand matrix. The GIS model has benefits because the model could be used to identify areas that are not adequately serviced with alternative transportation options for Florida’s vulnerable population, and it can guide policy makers to make decisions that foster equitable provision of transportation. The model is also capable of customizing variables such as users, transportation service providers, and geographic extent. To ensure the long-term sustainability and to serve the vision of the Safe Mobility for Life Program, the research team makes the following recommendations: first, an annual update of model data such as service provider information, street network, destination, and census data; second, adding a new webpage to current Find-a-Ride Florida website to disseminate the gaps maps to stakeholders to support planning and policy actions to improve transportation options in a local context.
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