대도시 교통수요관리를 위한 도로건설과 유발수요의 관계성 검증 - 서울시 내부순환도로 사례 연구 -

Abstract

The purpose of this study is to identify the relationship between highway capacity and induced travel demand using a case of the Naebu express Ringroad opened in 1999 in Seoul. The study reveals that the newly added road capacity induces travel demand as much as 14% in this case. It also identifies, from the three differenent scenario analyses, that the without-Naebu ringroad scenario is superior to the with-Naebu ringroad scenario in terms of securing more vehicle flows and reducing the traffic delay. The findings suggest that it is likely that highways built for relieving traffic congestion can aggravate network-wise traffic conditions because of the travel demand induced by the highway itself. With the results of this study, we can conclude that cities with extremely high density like Seoul are required to adopt policies such as TDM and ITS rather than road building in order to improve travel environment on the streets. TDM and ITS are less vulnerable to induced demand compared with road buildings. Lastly, it should be realized that this study has shortcomings in its methodology because it assumes the impact of induced demand remains within the first generation step among the 4 step travel forecasting precedures. Therefore, it is needed more researches for consolidating the conclusions out of this study.키워드(KeyWords):유발수요, 유발통행induced vehicle travel, induced demand