Abstract
The Cost-Benefit analysis is a worldwidely applied methodology to verify the validity of the transportation SOC project. But in general the indices included in the analysis are insufficient to measure various effects because there exists many difficulties to measure various qualitative benefits. In this research it is proposed that the closeness centrality can be utilized as a accessibility index. The closeness centrality is a index to measure the centrality of some node or region in social science area. We verify the suitability of the index with a small size network and suggest the application of the index on the feasibility study of the transportation SOC project.
