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原文传递 Concurrent Optimization of Signal Progression and Crossover Spacing for Diverging Diamond Interchanges

题名：	Concurrent Optimization of Signal Progression and Crossover Spacing for Diverging Diamond Interchanges
其他题名：	Bared,J.,Edara,P.,and Jagannathan,R.(2005)."Design and operational performance of double crossover intersection and diverging diamond interchange."Transp.Res.Rec.,1912,31-38.
正文语种：	英文
作者：	Yao Cheng
关键词：	Crossover spacing;Signal offsets;Concurrent optimization
摘要：	Diverging diamond interchanges (DDIs) are widely recognized to be capable of reducing conflict points, number of stops, and consequently average traffic delay. However, the design of their crossover spacing and signal offsets, which is critical to the capacity and efficient operations of DDIs, have not been addressed in most design guidelines. These two critical design components are actually interdependent in nature, because the estimated travel time between a DDI's two subintersections for all movement paths is essential for the design of signal offsets. Also, the crossover spacing should be designed to accommodate queues comprised mostly of those vehicles not moving within the signal progression band, which is often designed with a given crossover spacing. Considering such an interdependent relation between signal offsets and the crossover spacing, this study presents a model that can concurrently optimize these two vital DDI design elements at the planning level. A case study at a DDI site with the proposed model has also been conducted to justify the necessity to perform the concurrent optimization under different operational conditions. The results of extensive numerical experiments confirm that the design with the optimized crossover spacing and offset can yield the shortest total delay and the least number of stops for vehicles over the entire network, especially under near-saturated conditions. The optimized crossover spacing can also prevent the formation of the queue spillover over the crossovers in a DDI.
出版年：	2018
论文唯一标识：	P-72Y2018V144N03005
英文栏目名称：	TECHNICAL PAPERS
doi：	10.1061/JTEPBS.0000121
期刊名称：	Journal of Transportation Engineering
拼音刊名(出版物代码)：	P-72
卷：	144
期：	03
页码：	32-40