혼합교통류 상황에서 고속도로 유출연결로 적정길이 산정 방안 연구

Abstract

With the advent of autonomous driving, there has been an interaction between automated vehicles and manually-driven vehicles in mixed traffic flow on highways. The section to be analyzed in this study is the expressway of Busan, Gyeongbu Line, focusing on the accident occurrence section. The purpose of this paper is to 1) evaluate the safety of deceleration lane length in the outflow zone of the highway, and 2) analyze the operational efficiency according to the appropriate length calculation method of the highway deceleration lane, 3) Select the optimum deceleration lane length by combining the results of the safety and operational efficiency indicators. The analysis of micro traffic simulation led to the change of traffic flow and the safety and operational efficiency. The indicator of safety is the conflict rate and the indicator of operational efficiency is the average speed. The results of the analysis suggest that safety and operational efficiency increase as the proportion of autonomous vehicles increases. In addition, as the length of the deceleration lane increases, it is suggested that the mean velocity and the trade-off rate have constant wave characteristics. In this study, we presented a method to determine the optimal operating conditions for cluster analysis in mixed traffic flows. When the deceleration road is 200-220m in length and when the autonomous vehicle ratio is over 30, the traffic system confirms that it can derive optimal performance. The operation method and evaluation methodology suggested in this study can be used for the analysis of traffic operation efficiency and safety.| 자율화 시대의 도래로 고속도로에서 자율차와 비자율차가 혼재되어 있는 상황에서는 개별 자율차의 인근 비자율차에 영향을 미쳐 교통류의 성능이 저하될 것을 알고 있다.본 연구에 분석 대상 구간은 실증사업 구간 중 사고다발구간을 중심으로 경부선 부산 방향 고속도로이다.본 논문의 연구 목적은 1)고속도로 유출 구역에서 각각 감속차로 길이의 안전성을 평가하며，2)고속도로 감속차로 적정길이 산정 방안을 따라 운영 효율성을 분석하며,3) 안전성 및 운영 효율성 평가지표의 결과를 결합하여 최적의 감속차로 길이를 선정한다. 미시적 교통시뮬레이션 분석을 통해 교통류의 변화를 도출하였으며 안전성 및 운영 효율성을 분석하였다. 안전성의 평가지표는 상충률이며,운영 효율성의 평가지표는 평균속도이다. 분석결과는 자율차량의 비율이 커짐에 따라 안전성과 운영 효률성을 증가하는 것으로 판단하다. 또한 감속차로 길이가 증가할수록 편균속도 및 상충률은 일정한 파동성이 있는 것을 제시하였다. 혼합교통류 상황에서 군집 분석 최적 운영 조건을 판단하는 방법을 제시하였으며, 감속차로 길이가 200~220m인 경우 및 자율차 비율이 30 이상일 때 교통시스템은 최적의 성능을 유도할 수 있음을 확인한다. 본 연구에서 제시한 운행 방안 및 평가방법론은 교통 운영 효율성 및 안전성 분석에 활용 가능 할 것으로 판단한다.; With the advent of autonomous driving, there has been an interaction between automated vehicles and manually-driven vehicles in mixed traffic flow on highways. The section to be analyzed in this study is the expressway of Busan, Gyeongbu Line, focusing on the accident occurrence section. The purpose of this paper is to 1) evaluate the safety of deceleration lane length in the outflow zone of the highway, and 2) analyze the operational efficiency according to the appropriate length calculation method of the highway deceleration lane, 3) Select the optimum deceleration lane length by combining the results of the safety and operational efficiency indicators. The analysis of micro traffic simulation led to the change of traffic flow and the safety and operational efficiency. The indicator of safety is the conflict rate and the indicator of operational efficiency is the average speed. The results of the analysis suggest that safety and operational efficiency increase as the proportion of autonomous vehicles increases. In addition, as the length of the deceleration lane increases, it is suggested that the mean velocity and the trade-off rate have constant wave characteristics. In this study, we presented a method to determine the optimal operating conditions for cluster analysis in mixed traffic flows. When the deceleration road is 200-220m in length and when the autonomous vehicle ratio is over 30, the traffic system confirms that it can derive optimal performance. The operation method and evaluation methodology suggested in this study can be used for the analysis of traffic operation efficiency and safety.