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The Selection of Optimal Interchange Types by Quantifying the User Costs and Construction Costs of Ramps  

Kim, Sang-Youp (서울시립대학교 교통공학과)
Choi, Jai-Sung (서울시립대학교 교통공학과)
Min, Kyung-Chan (서울시립대학교 교통공학과)
Choi, Hyun-Ho (한국도로공사 기술심사처)
Publication Information
International Journal of Highway Engineering / v.12, no.2, 2010 , pp. 33-41 More about this Journal
Abstract
It is stated in the highway geometric design guide that expressway interchange types should be selected considering a set of input variables including travel demand, topography, construction cost and interchange spacing. However, this selection method has a problem of providing different interchange types even for the same input variables depending upon different applications of engineers discretion. A procedure that produces consistent results is necessary and this paper presents the development of an efficient and reliable procedure based on the quantification of road user costs and construction costs on interchanges. To develop this procedure, a survey of existing expressway interchange types in South Korea was made and 10 basic interchange types and 52 supplementary interchange types were identified. To relate road user costs and construction costs to these interchange types, this research uses two method. First, interchange types were expressed by a set of ramp configurations. Second, road user benefits and construction costs associated with these different interchange types were formulated based on the current national guide of the expressway economical analysis. As a result, it was proved that an interchange type to provide minimum costs could be selected consistently and this research result should be useful for future expressway geometric designs.
Keywords
optimal interchange types; ramp configurations; quantification; road user cost; construction costs;
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