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Article

An Evaluation of Design Standard for Freeway Weaving Section Length for Operational Efficiency

고속도로 엇갈림구간의 효율적 운영을 위한 구간길이 설계기준 적정성 평가

Taewan KIM1
,
Seungjun LEE2
,
Ducknyung KIM3
,
Chansu REEM4
,
Youngjun KIM5
,
Euntak LEE5*
,
Bongsoo SON6
김 태완1
,
이 승준2
,
김 덕녕3
,
임 찬수4
,
김 영준5
,
이 은탁5*
,
손 봉수6
1Professor, Department of Urban Engineering, Chung-Ang University, Seoul 06974, Korea
2Research Fellow, Korea Expressway Corporation, Kyeonggi-do 18489, Korea
3Deputy Principal Researcher, Korea Expressway Corporation, Kyeonggi-do 18489, Korea
4Department Manager, Korea Expressway Corporation, Kyeonggi-do 18489, Korea
5Researcher, Department of Urban Planning and Engineering, Yonsei University, Seoul 03722, Korea
6Professor, Department of Urban Planning and Engineering, Yonsei University, Seoul 03722, Korea
1중앙대학교 도시공학과 교수
2한국도로공사 도로교통연구원 연구위원
3한국도로공사 도로교통연구원 책임연구원
4한국도로공사 도로교통연구원 실장
5연세대학교 도시공학과 연구원
6연세대학교 도시공학과 교수
*Corresponding Author
28 February 2021. pp. 62-77
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Abstract

On freeway weaving sections, traffic congestion and accidents occur frequently due to the disturbance generated by lane-changing vehicles. In order to reduce the disturbance, weaving section should be sufficiently long. The relationship between weaving length and density, or equivalent level of service, is suggested in Korea Highway Capacity Manual (KHCM). However, it is not fully demonstrated whether the suggested relationship is appropriate or not. The purpose of this paper is to investigate the appropriateness of KHCM standard compared with field data and micro-simulation results. The analysis results show that the density or level of service estimated by KHCM and micro-simulation are significantly different. This implies that KHCM has employed a single equation in order to estimate the densities of many different types of weaving sections, so it is not enough to represent vehicular behaviors somewhat complicated occurring on weaving sections. It, consequently, is suggested that KHCM standard for freeway weaving length should be carefully reassessed by using the data obtained from the field.

Keywords
freeway weaving section
Korea highway capacity manual (KHCM)
traffic operation
traffic safety
VISSIM

고속도로 엇갈림구간은 잦은 차로변경으로 인해 통행속도가 급격하게 저하함에 따라 교통 혼잡이 발생하며 교통사고 발생 가능성이 있는 구간이다. 이에 엇갈림구간은 정체와 사고를 줄일 수 있도록 설계단계부터 면밀한 검토가 필요하나 국내에는 엇갈림구간 설계기준이 아직 미비한 상태이다. 엇갈림구간 설계에서 가장 중요한 것은 엇갈림구간의 길이로서, 적정한 길이 산정은 주로 한국도로용량편람(Korea highway capacity manual, KHCM)의 엇갈림구간 밀도산정식을 활용하고 있으나 이 산정식의 적정성에 대하여는 아직 명확히 밝혀진 바가 없다. 본 연구에서는 전국의 54개 고속도로 엇갈림구간을 6개 유형으로 분류하고, KHCM 밀도산정식의 적정성을 현장관측자료로 평가한 후 미시교통시뮬레이션 프로그램을 활용한 시나리오 분석을 진행하여 엇갈림구간 길이의 설계기준에 대한 적정성을 평가하였다. 분석결과, KHCM과 미시시뮬레이션의 결과 값은 많은 차이를 보였는데 그 이유는 KHCM의 밀도식이 차량의 급가감속 등 불규칙적인 통행행태를 제대로 반영하지 못하기 때문인 것으로 추정된다. 석수IC 엇갈림구간 유형에 대한 VISSIM 분석결과, 구간길이가 250m 이하이면 교통량에 따라 서비스수준이 매우 민감하게 변화하여 교통 운영과 안전 측면에서 매우 불안정한 교통류가 발생하는 것으로 분석되었다. 구간길이가 550m 이상인 경우 엇갈림구간의 서비스수준은 거의 변화하지 않는 것을 확인하였으며, 이는 구간길이를 최대 750m로 제시하는 KHCM의 설계 길이 범위에 대해 고찰할 필요가 있음을 시사하고 있다. 본 연구의 결과는 향후 KHCM 밀도식의 개정의 필요성을 제시하고 있으며, 이를 위해서는 보다 많은 현장관측자료와 이를 설명할 수 있는 이론의 개발이 요구된다.

키워드
고속도로 엇갈림구간
교통운영
교통안전
한국도로용량편람
VISSIM
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Information
  • Publisher :Korean Society of Transportation
  • Publisher(Ko) :대한교통학회
  • Journal Title :Journal of Korean Society of Transportation
  • Journal Title(Ko) :대한교통학회지
  • Volume : 39
  • No :1
  • Pages :62-77
  • Received Date : 2021-02-01
  • Revised Date : 2021-02-09
  • Accepted Date : 2021-02-15
  • DOI :https://doi.org/10.7470/jkst.2021.39.1.062
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