• Title/Summary/Keyword: 여유녹색시간

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A Study on the Application Method of All-Red Phase at the Signalized Intersection (신호교차로의 전적신호 적용방법 연구)

  • Woo, Yong-Han;Ryu, Yeong-Geun;Lee, Sang-Hyuk
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.16 no.5
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    • pp.29-37
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    • 2017
  • Intersection signal's phase time is calculated and determined by car and pedestrian traffic volume. If signal phase time and traffic volume dis-matched, cars and pedestrians have much delay time. This paper suggested an All-Red phase application method that cars and pedestrians securing safety and minimizing traffic signal waiting time. The key solution of this suggested method is determining All-Red phase operation by using sum of spare green time that have no passing cars. That is, total time of spare green time that have no passing cars is longer than All-Red phase time, operating All-Red phase has an effect. And case study carried out at the signalized intersection, revealed that this suggested method has much effectiveness.

Optimal Signal Times for Active Bus Signal Priority on Median Bus Lane Using Deterministic Delay Model (중앙버스전용차로상에서 결정적 지체모형을 이용한 능동형 버스우선신호의 최적 신호시간 산출방안)

  • Kim, Tae-Woon;Jeong, Young-Je;Kim, Young-Chan
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.13 no.1
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    • pp.15-25
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    • 2014
  • Bus signal priority is a name for various techniques to speed up bus public transport services at intersections with traffic signals. In this study propose methodology to optimize signal times for Early green, Green extension out of the active bus signal priority using deterministic delay model in isolated intersection on median bus lane. Fluctuation is found in the vehicle delay and person delay in the event that using this methodology redistributed to green time and checking slack green time is correct value by sensitivity analysis. As a result of the study, car delay is increased a little and person delay is decreased. As a result of slack green time sensitivity, delay is not much in it if variation of slack green time under 30%. But this methodology effectiveness is under claimed capacity if variation of slack green time over 30%.

Signal Timing and Intersection Waiting Time Calculation Model using Analytical Method for Active Tram Signal Priority (해석적 방법을 이용한 능동식 트램 우선신호의 신호시간 및 교차로 대기시간 산정 모형)

  • Jeong, Youngje;Jeong, Jun Ha;Joo, Doo Hwan;Lee, Ho Won;Heo, Nak Won
    • Journal of Korean Society of Transportation
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    • v.32 no.4
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    • pp.410-420
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    • 2014
  • This research suggests a new tram signal priority model which determines signal timings and tram intersection waiting time using analytical method. This model can calculate the signal timings for Early Green and Green Extension among the active tram signal priority techniques by tram detection time of upstream detector. Moreover, it can determine the tram intersection waiting time that means tram intersection travel time delay from a vantage point of tram travel. Under the active tram signal priority condition, priority phases can bring additional green time from variable green time of non-priority phases. In this study, the signal timing and tram intersection waiting time calculation model was set up using analytical methods. In case studies using an isolated intersection, this study checks tram intersection waiting time ranged 12.7 to 29.4 seconds when variable green times of non-priority phases are 44 to 10 seconds under 120 seconds of cycle length.

Study on the Installation warrants of staggered crosswalk traffic island on Urban Streets - Focusing on pedestrian safety and service level - (도시부가로 이단 횡단보도 교통섬 설치 준거에 관한 연구 - 보행자 안전과 서비스수준을 중심으로 -)

  • Shim, Kwan-Bo;Kim, Joong-Hyo;Park, Kyung-Woo;Ha, Dong-Ik
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.12 no.6
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    • pp.97-107
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    • 2013
  • On the Staggered Crosswalks, pedestrians cross the crosswalks two times. This method can reduce the cycle, the vehicle delay and the walking distance by increasing the major direction of green time. The safety of pedestrians is also effective. This study suggests the warrant of the facilities of island width and length etc. by considering the road structure and pedestrians. Also this study suggests the standard of the safety through the accident analysis of Staggered crosswalks and General Crosswalks. In the results, accident rate of the Staggered Crosswalks 18.3(100 million vehicle-km) was lower than the accident rate of the General Crosswalks 28.3(100million vehicle-km). By understanding the start point of crossing of the Staggered Crosswalks, the analysis of the location and types of accident suggests the safety zone(spare space). The setting warrants of Staggered Crosswalks are 4 lane over the road and the 2 meter over sidewalk width of island. The minimum length of the Pedestrian island was doubled compared to the crosswalks width. And the maximum length was set by considering the wait time of the pedestrians.