American Society of Civil Engineers


Countermeasure Against the Capacity Loss and Over-Saturation Escalation of Signalized Intersection Group on Urban Arterial


by Yang Wu, (School of Traffic and Transportation, Southwest Jiaotong University. Chengdu, China. P.O. BOX 610031. E-mail: wuyang333@yahoo.com.cn), Xia Luo, (School of Traffic and Transportation, Southwest Jiaotong University. Chengdu, China. P.O. BOX 610031.), and Lei Lei, (School of Traffic and Transportation, Southwest Jiaotong University. Chengdu, China. P.O. BOX 610031.)

pp. 3423-3428, (doi:  http://dx.doi.org/10.1061/41039(345)564)

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Document type: Conference Proceeding Paper
Part of: International Conference on Transportation Engineering 2009
Abstract: The surplus traffic demand exceeding the capacity of intersection gives rise to the overflow queue in oversaturated condition. The excessive expansion of overflow queue from the downstream to the upstream (i.e. over-range spillback) results in upstream intersection’s capacity loss and over-saturation’s backward escalation, leading to deteriorating increase in travel delay of intersection group. The boundary condition of overflow queue length avoiding its over-range spillback (determined by roadway, traffic and signal parameters) is analyzed by means of traffic flow ‘shock wave’ method. It is concluded that the equalized saturation-degree (subjecting to the boundary condition aforementioned) of each intersection contained by intersection group on urban arterial, can minimize the global rather than local travel delay of intersection group.


ASCE Subject Headings:
Intersections
Traffic signals
Urban areas
Traffic congestion