過飽和交通狀態에서의 SPLIT COORDINATION信號制御戰略

서지정보

· 발행기관 : 대한교통학회
· 수록지 정보 : 대한교통학회지 / 11권 / 1호
· 저자명 : 李光勳

목차

ABSTRACT
Ⅰ. 序論
Ⅱ. split coordination制御의 槪念
Ⅲ. feedback制御 파라메타와 檢知器의 要件
Ⅳ. 시뮬레이션에 의한 split coordination制御의 評價
Ⅴ. split coordination制御機能의 考察
Ⅵ. 結論 및 課題
參考文獻

영어초록

The subject this paper is the signal control strategy under oversaturated conditions. The nature of traffic control for oversaturation is essentially different from the standard control modes. While under non-saturated situation traffic control is needed for the sake of safety and efficiency, the throughput is essential under oversaturated conditions. Therefore both objective and strategies differ. For an oversaturated stream the cycle time and the signal offset are thought to be of rather secondary importance. For this case the green split may well be the most important control variable to serve the excessive demand. Up to now, however, most efforts have concentrated on the strategy with the concept which lies just on the extension of Webster's.
"Green-split Coordination Strategy for Over-Saturated Networks", presents newly contrived three types of strategies named Forward-coordination, Backward-coordination and Network-coordination respectively and describes the algorithms with the evaluations.
The forward coordination strategy treats the forward wave of flow between two signals. The aim is to prevent the outbreak of queue due to the accumulation of temporary excess of demand in near-saturation or saturation flow.
The backward coordination strategy treats the backward wave of flow between two signals. The goal is to prevent the waste of green time caused by the exit block at the upstream signal. for this purpose a feedback regulation is provided of the upstream green-split so that the inflow-outflow balance is kept zero. The resultant surplus of green time is alloted to other signal stages. Also here the examination is made of the appropriate value of the feedback control parameter.
The network coordination strategy is operated to maximize the network throughput in a specific direction applying a bang-bang control at the bottleneck intersection. This is a type of intervenient control for policy reasons.
For this strategy the green-split coordinations, particuarly the backward coordination, are essential as the tactical elements.
In order to evaluate the proposed strategies those are compared with the latest existing strategy called saturation-degree-ratio control by the simulation experiments in an assumed 4 × 4 grid network.
The results are satisfactory showing a 10-15% reduction in delays and a 15% increase in network capacity.

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