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Relation between Highway Improvement and Induced Travel Demand, and Estimate the Demand Elasticity (A Seoul Metropolitan Area Case)  

Lee, Gyu-Jin (아주대학교 건설교통공학과)
Choe, Gi-Ju (아주대학교 교통공학과)
Sim, Sang-U (아주대학교 건설교통공학과)
Kim, Sang-Su (아주대학교 건설교통공학과)
Publication Information
Journal of Korean Society of Transportation / v.24, no.4, 2006 , pp. 7-17 More about this Journal
Abstract
The purpose or this paper is to investigate the relationship between highway improvement and Induced Travel Demand(ITD) focusing on the Seoul metropolitan area data. In addition, authors tried to estimate basic unit of demand elasticity focusing on zone and trip purpose which can be applied for the ITD forecasting. The results are based on the 2002 Metropolitan Household Transportation Survey Data, where the demand elasticity (DE) is -0.582 in Seoul, -0.597 in Incheon and -0.559 in Gyounggi province, respectively. This study revealed part of the relationship between highway improvement and ITD for metropolitan region and provided the framework for yielding real estimated values by applying the concept of demand elasticity in terms of the relationship by using regional and long-term data. We expect that the basic unit of demand elasticity focusing on zone and trip purpose can be applied for the ITD forecasting to analyze the whole demand exactly The estimated DE's for age group and day of week can also be used for Proper transportation management and transport Policy making. Some limitations have also been discussed.
Keywords
Highway Improvement; Induced Travel Demand; 2002 Metropolitan Household Transportation Survey; Demand Elasticity; Log-Linear Regression Model;
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