• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.1D
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• pp.1-11
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• 2012

The presidential council on national competitiveness and the national police agency have initiated a national project to refresh the road traffic control and operation systems to increase operational efficiency at signalized intersections. It would reduce the number of stops and delay of vehicles at intersections and thus mitigate congestion and emission. Although significant reduction of carbon is expected as a consequential result, such effects has yet been studied since traffic operation was behind of interest in the field of green transportation where planning was mainly involved. This paper delivers the macroscopic effects of carbon reduction of the selected items of the national project: the ones managed by the police agency. The results showed that the studied items yield significant reduction of carbon: pedestrian push button operation, flashing signal operation, progression, lagging left turns, permitted left turn, and actuated left-turn operation would reduce 12.31%, 3.27%, 2.44%, 0.97%, 0.81%, and 0.72% of the total amount of carbon emitted a year in a whole transportation sector, respectively.

• Journal of Korean Society of Transportation
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• v.20 no.3
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• pp.193-207
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• 2002

실시간 교통신호 제어시스템은 검지기 체계로부터 교통소통자료를 수집하고, 이를 중앙시스템에서 실시간으로 분석, 처리하여 신호시간을 신호주기별로 산출하는 시스템이다. 신호제어시스템의 운영성과는 시스템의 신호제어기능 또는 제어 알고리즘을 활용할 수 있는 신호제어전략의 효율성 여부에 의하여 크게 좌우된다. 본 연구에서는 신신호 시스템의 기본 제어알고리즘과 개선된 신호제어 알고리즘을 개관하고, 신신호시스템의 운영성과를 현장자료를 토대로 분석하였다. 신신호 시스템의 운영성과는 시스템의 제어기능과 알고리즘을 토대로 비 중요교차로의 패턴 Table을 조정하여 신호제어전략을 수립하고, 이의 적용성을 분석하는 과정을 통하여 분석되었다. 운영성과는 시범지역의 남북 교통축(영동대로)과 동서 교통축(도곡동길)을 대상으로 분석하였다. 분석결과 영동대로는 비 중요 교차로의 패턴 Table을 조정함에 따라 시스템 운영성과가 현저하게 개선되는 것을 확인할 수 있었으며, 도곡동길은 현재의 신호운영 전략과 검토대안이 비슷한 수준의 운영성과를 도출하는 것으로 분석되었다. 시범 운영지역의 교통축은 1개의 중요 교차로와 5-6개의 비 중요 교차로로 구성된다. 영동대로의 운영성과 분석결과, 교통축의 운영효과는 중요교차로의 교통대응 제어기능과 동시에 비 중요 교차로의 패턴 제어기능이 적절하게 연계 운영될 때 운영효율성을 높일 수 있음을 확인하였다. 따라서 향후 신호운영의 효율성을 높이기 위해서는 중요교차로의 교통대응 제어기능의 개선과 동시에 비중요교차로의 패턴 Table의 개선이 필수적인 것으로 판단된다.

• Journal of Korean Society of Transportation
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• v.22 no.1 s.72
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• pp.83-94
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• 2004

In 1968, United Nation prepared conventions to promote the safety and vitalization of traffic to accomodate increased international business and personal activities. They are convention on rad traffic and convention on road signs and signals. These conventions define the shape, color and the operational guidelines of signs, marking and traffic signals. However, the Korean road traffic law enforces independently the manufactural and operational guidelines of those devices and marking. Due to different regulations described in those two, potential problem might be expected in terms of international traffic in the near future in Korea. This paper presents the academical comparison between these two different road traffic regulations established by the Korean legislature and United Nation. It suggests a list of researches recommended for the nation to be ready to integrate international traffic.

• Journal of Korean Society of Transportation
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• v.21 no.2
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• pp.83-94
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• 2003

Many cities, recently, have convertedoptimized fixed-time control to adaptive traffic system in the control of their signalized traffic network. The expected benefit from the adaptive traffic system is its ability to constantly modify signal timing to most effectively accommodate changed traffic conditions. While the potential benefits from this control structure may be significant, few studies have compared the effect of implementing this method of signal control against other alternative signal control strategies, because it is too difficult to evaluate the efficiency of the real-time adaptive system. The objectives of this research are : to develop a microscopic simulator and to compare the effect at isolated intersections, corridors, and networks between the fixed signal timing plan and adaptive traffic signal system. This simulator will have allowed more sophisticated analysis techniques for the study of traffic control. Also, this research using this simulator evaluated a real-time traffic responsive signal system used in Seoul Korea

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.69-73
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• 2006

일반신호기는 정해진 신호시간에 따라 독립적으로 운영되는 정주기신호기와 TOD(Time of Day)식 신호기이다. 이런 일반신호기의 단점으로는 변동되는 교통량에 대응이 불가능하고, 교통량에 관계없이 연속적으로 신호체계가 이루어지기 때문에 차량의 이동성이 비효율적으로 됨에 따라 생산성 감소, 에너지낭비 및 자동차 배기가스 증가를 초래하고 있다 이를 개선하기 위한 방법으로서 본 논문에서는 4차선의 주차로와 2차선의 소방로로 이루어진 교차로에서 주차로의 교통량이 많을 경우, 차로에서는 녹색불이 지속되어 교통의 흐름을 원활하게 해주며, 소방로에서 차량이 일정량 증가하게 되면, 주차로의 신호등이 적색등을 바꾸어 소방로의 차량이 교통되도록 하는 지능형 교통체계에 대해 VHDL을 이용하여 지능형 신호체계 시스템을 설계하였다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.2
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• pp.35-41
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• 2011

The national police agency has executed the project for the advancement of traffic control and operation systems in order to mitigate chronic traffic problems and to meet the global standards regarding the traffic control and operation systems. This study effort was initiated to evaluate the effects of various policies proposed for the advancement of traffic control and operation systems. The evaluation results indicated that the policies proposed for the advancement of traffic control and operation systems showed apparent and positive effects in terms of transportation mobility and safety. However, there have been many difficulties to overcome in order to settle down the policies proposed for the advancement of traffic control and operation systems as smooth as possible. For example, the violation of intersection passing method has been increased after the implementation of the advancement of traffic control and operation systems in majority of evaluation sites. In addition, lacks of awareness as well as improper operations of the advancement of traffic control and operation systems have caused drivers' confusions, which generated more traffic congestion and risks. Currently, the policies for the advancement of traffic control and operation systems focused on the improvements of traffic signal operations, including leading through movements and permissive left-turns. However, synergy effects may be expected if all of the policies including the improvements of traffic signal operations are executed together.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.9 no.4
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• pp.60-67
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• 2010

Delay reduction of vehicles at the intersection is highly dependent on the signal operation method. Most previous traffic operations have focused on minimizing delay by adjust traffic offset. However, these methods have limitation in solving traffic problem if the volume reaches or exceeds the capacity. In this paper, it was analyzed that the effectiveness of various signal operation methods such as left-turn prohibition, and using protected mixed with permitted left turn using the traffic data from Daejeon city. In case of the left-turn prohibition of a intersection, the control delay reduced from 54.2 seconds to 22.7 seconds and especially, the delay of the southbound was drastically reduced. In addition, the delay was highly reduced from 27.0 seconds to 12.1 seconds when the operation system was changed to use protected mixed with permitted left turn.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.4
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• pp.48-62
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• 2023

Recently, smart intersections have been installed in many intelligent transportation system projects, but few cases use them for traffic signal operations besides traffic volume collection and statistical analysis. In order to respond to chronic traffic congestion, it is necessary to implement efficient signal operations using data collected from smart intersections. Therefore, this study establishes a procedure for operating a real-time traffic signal control algorithm using smart intersection data for efficient traffic signal operations and improving the existing algorithm. Effect analysis confirmed that intersection delays are reduced and the section speed improves when the offset is adjusted.

• Journal of the Korean Society for Railway
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• v.18 no.1
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• pp.25-32
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• 2015

It has been subject to question whether a conventional traffic signal controller can support efficient operation at grade intersections in which vehicles and tram lines cross concurrently. This study proposes a list of functional requirements for a traffic signal controller to support effective operation of trams at such an intersection. The considered details includes the combinations of geometric conditions at which vehicle, bus, and tram lines are aligned, the types of exclusive tram signals, and the combinations of various signal phases, including exclusive tram phases, which are currently undefined in the nation. The results suggest that the controller should be capable of dealing with the NEMA standard overlap relays and a quadruple-ring phase representation scheme.

• Journal of Korean Society of Transportation
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• v.16 no.2
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• pp.145-155
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• 1998

대도시 가로망의 대부분은 신호교차로와 신호교차로가 연결되는 가로(link)로 구성되어 있어 가로의 통행시간은 가로의 주변여건, 차량간의 상호작용 및 교통신호등과 같은 요소에 영향을 받게된다. 따라서 본 연구의 목적은 대도시 가로망에서 신호 연동체계로 운영되는 가로의 통행시간을 예측할 수 있는 모형을 개발하는데 있다. 본 연구는 대구광역시 가로망을 대상으로 연동가로의 교통흐름을 가장 잘 나타내는 Greenberg모형을 이용하여 연동가로의 통행시간 모형을 도출하였다. 도출된 연동가로의 통행시간 모형은 임계통행시간$(t_m$)과 교통량 대가로최대교통량비$(q/q_m)$의 함수로 이루어졌다. $t_m$모형은 안정류상태의 통행시간 및 불안정류상태의 통행시간의 비를 이용하여 개발하였고 가로 용량모형은 상류부와 하류부의 신호조건에 따른 변수와 가로길이를 변수로 하는 모형을 개발하였다. 개발된 모형은 대구광역시를 대상으로 조사한 12개의 연동가로의 자료를 적용하여 연동으로 운영되는 가로의 통행시간 모형을 도출하였다. 도출된 통행시간 모형은 도로용량에 제시한 모형에 비하여 간단하게 가로의 통행시간을 추정할 수 있으며 교통계획에 적용되는 통행시간모형 비하여 가로의 신호 및 운영조건을 포함한 세부적인 통행시간 모형이다.