도시고속도로의 램프접속 영향권 내 속도전환 모형구축에 관한 연구

Abstract

Generally urban freeway is a divided highway facility with 4 lanes and over, and also a principal arterial for the movement of high-volumes of traffic in the big city. However, most of the urban freeways do not play their roles in the urban transportation system because of incoming and outgoing traffic concentrated on the urban freeway regardless of the peak periods. Thus, the purpose of this study is to investigate speed data for identifying the speed characteristics on the ramp influence area of the urban freeway under the study, analyze speed data investigated with those calculated by the existing speed conversion models on the ramp influence area of the freeway under the study, and finally construct the speed conversion models on the ramp influence area of the urban freeway under the study.

From the results of the real-time speed characteristic analyses and the speed conversion models constructed on the ramp influence area of the urban freeway under the study, the following conclusions were drawn

ⅰ) The space mean speed must be used for the reliability of the speed characteristic analyses on the ramp influence area of the urban freeway, because a big difference was shown between the time mean speed and the space mean speed on the ramp influence area of the urban freeway.

ⅱ) The speed conversion models must be newly constructed for the reliability of the speed characteristic analyses on the ramp influence area of the urban freeway, because the space mean speed showed a remarkable difference when to compare with those calculated by the existing speed conversion models based on the results of the analysis of variance(ANOVA).

ⅲ) The speed conversion models must be highly explanatory in the speed characteristic analyses, because the correlation coefficient() values showed 0.96 and over regardless of the direction and ramp influence area, based on the results of the correlation analysis for the new speed conversion models constructed on the ramp influence area of urban freeway under the study.