Journal of Korean Society of Transportation ISSN:1229-1366(Print) 2234-4217(Online) 대한교통학회지

The purpose of this study is to test applicability of cut-through roundabouts at a congested tersection and to provide the traffic volume ranges for theirs application. Various test scenarios were veloped according to variation of total traffic volume, left-turn ratio to total traffic volume, and ratio major road traffic volume to minor road traffic volume. In addition, three intersection types of t-through roundabout, roundabout, and signalized intersection were compared with respect to delay mes for each scenario, resulted from the simulation using VISSIM. In case of the ratio of major road affic volume to minor road traffic volume, 6:4, the delay times of cut-through roundabout decreased up 30% of left-turn ratio to total traffic volume for 400vphpl, up to 20% for 500vphpl, up to 10% for 00vphpl. In case of the ratio, 7:3, they are the same as 6:4 for 400vphpl, 500vphpl, and 600vphpl but ey decreased up to 30% for 300vphpl and up to 10% for 700vphpl. In case of the ratio, 8:2, they are the me as 7:3 for 400vphpl, 500vphpl, and 700vphpl but they were reduced by 10% to 30% for 300vphpl d 20% for 600vphpl. It is concluded that the smaller left-turn ratio to total traffic volume as well as the tio of minor road traffic volume to major road traffic volume is, the more effective in reducing delay mes the cut-through roundabout is. Cut-through roundabouts can be expected to reduce delay times at a gnalized intersections with traffic conditions above-mentioned.