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Noreen McDonald-PI. STRIDE-funded research suggests that the density of residential developments with a one-half mile radius of newly constructed schools influence school transportation system design, mode splits and costs. This research, conducted by STRIDE-sponsored researchers at UNC Chapel Hill, North Carolina State University and the University of Florida, evaluated school transportation costs for 20 schools in the Southeast United States – 11 in North Carolina and 9 in Florida. However, design and methodological limitations presented by this selection of schools makes it difficult to evaluate the relationship beyond a cross-sectional overview of trends. This research proposal will achieve two important contributions. First, it will expand our understanding of the connections between school transportation costs and site location by utilizing secondary data from North Carolina that will allow us to assess these relationships by school location, size, and age of school. This will greatly increase the generalizability of the research. Second, the phenomenon of school construction and nearby residential development growth is a dynamic issue that must be understood as a function of time. Thus, this research will use secondary data from North Carolina to assess how changing residential patterns affect school transportation costs over time.