Signal Metering 운영기법을 활용한 회전교차로의 지체시간 분석 연구
A Study of Delay Time Analysis at Metering Roundabout
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초록
Signal Metering 회전교차로는 첨두시 지체도 감소에 효과적이다. 2011년 회전교차로의 도입으로 인한 국내 회전교차로에 대한 연구는 활발하지만 주 접근로의 효과분석에 편중되어 있다고 할 수 있다. 또한, 회전교차로가 활성화되어 있는 미국 및 호주(차로별 분석)와 다른 접근로 통합 분석 방법을 사용하고 있다. 이 방식은 다차로 회전교차로의 분석에 있어 정밀한 분석이 어렵다는 단점이 있다. 따라서 본 연구는 실제 Metering 기법으로 운영되는 호주의 Signal Metering 회전교차로를 대상으로 차로별 분석과 통합분석의 비교 분석을 통한 운영 효과를 살펴보고자 한다. 효과적인 분석을 위해 회전교차로의 분석에 널리 사용되는 Micro-simulation software인 AIMSUN7을 사용하였으며, Metering 회전교차로의 운영 시 주 접근로의 지체도가 큰 폭으로 감소하는 것으로 나타났다. 또한, 차로별 분석방법과 통합 분석 방법의 지체시간 분석결과 Metering 운영기법을 사용할 경우 교차로 전체의 지체시간은 차로별 분석 144.23초/대, 통합분석 145.95초/대로 두 방법 간 1.7초/대의 차이가 발생하는 것으로 분석되었다.
Abstract
A signal metering roundabout is able to reduce delay times, particularly during peak periods. Over time a number of studies have analyzed and assessed its performance. Since 2011, Korea also has adopted roundabouts as intersection control devices. However, the majority of studies regarding metering roundabouts have focused on one traffic signal metering roundabout only. Furthermore, Korea uses a different roundabout analysis method (the aggregated method, rather then the lane-by-lane method used by Australia and the US) due the shortage of data and history of use in Korea. An accurate analysis of multi-lane roundabouts in Korea is thus limited. This study, therefore, has compared both methods based on the Old Belair road metering roundabout in Adelaide which is operated by two traffic signals and consists of two approach lanes entering and exiting. The results from the analysis showed that the metering roundabout can decrease the delay time of the dominant approach significantly, however, the delay time of other approaches was increased under both models. Moreover, lane-by-lane method showed that the metering roundabout can decrease the total roundabout delay time, whereas the metering roundabout increases the total delay time using the aggregated method, and their difference is approximately 1.7s/veh.
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