Journal of Korean Society of Transportation (대한교통학회지)

Korean Society of Transportation (대한교통학회)
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Improvement of the HCM Delay Estimation Model for Exclusive Permitted Left Turns

비보호 좌회전 지체도 추정모형의 개선

  • 김진태 (한양대학교 첨단도로연구센터)
  • Published : 2003.04.01
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Abstract

Highway Capacity Manual (HCM) provides an analytical delay estimation model to assist the evaluation of traffic at a signalized intersection. The model revised and included in the HCM published in the year 2000 reflects the results of recent studies and is utilized in various fields of transportation studies. For the implementation of the model in the case of permitted left turns, the HCM supplement provides a computational procedure to adjust the saturation flow rate of permitted left toms. The model however, is originally designed for a protected movement and thus underestimates the delay of permitted left turns due to its difference right-of-way nature. This document describes (1) a review of the theoretical background of the HCM delay estimation model, (2) problems embedded in the model for the delay estimation of permitted left turns, (3) a proposed model developed in this study to improve the delay estimation for permitted left turns and (4) a set of verification tests. In order to reflect various traffic and control conditions in the test, simulation studies were performed to by using the field data based on 120 different permitted left-turn scenarios. Comparison studies conducted between sets of delays estimated by the HCM and the proposed models against a set of the CORSIM delays and showed that the proposed model improved the estimation of the permitted left-turn delays. The explanatory variable of the relationship between the HCM delay and the simulation delay was 0.47 and the one between the delay estimated by the proposed model and the simulation delay was 0.77.

미국 도로용량편람(HCM)은 도심부 신호 교차로 운영상태 평가를 돕기 위하여 지체도 추정 수리모형을 제시하고 있다. 2000년도 개정판 HCM모형은 전문가들의 최근(up-to-date) 연구결과가 반영된 것이며 많은 교통공학자들에 의해 실무 및 연구에 활용되고 있다. HCM은 비보호 좌회전 움직임의 경우, 별도의 부가절차를 통해 포화교통류율을 보정할 것을 제시하고 있다. 그러나 HCM 지체도 산정 모형식은 보호현시 직진 움직임을 기준으로 설계된 모형이기 때문에 비보호 좌회전 움직임의 지체도를 과소 추정하는 문제점을 내제한다. 본 논문에서는 (1)HCM지체도 모형의 설계과정을 검토하고 (2)이를 토대로 HCM 지체도모형을 통한 비보호 좌회전 지체도 추정에 문제가 있음을 지적하고 (3)새로운 비보호 좌회전 지체도 추정 수리모형을 제안한다. 다양한 교통상황. 제어상황을 현장실험에서 통제함에 어려움이 있어 모의실험을 통한 제안모형의 검증을 수행하였다. 검증을 위해 마련된 120가지 경우의 다양한 비보호 좌회전 교통상황에서 (1)CORSIM 모의실험 지체도, (2)HCM 모형추정 지체도, (3)제안된 모형추정 지체도를 비교하였으며, 비교분석 결과 모의실험 지체도를 기준으로 HCM지체도 추정모형은 설명력이 0.47로, 제안된 모형의 설명력은 0.77로 분석되었다.

Keywords

References

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