Experimental investigation of spatial breakdown evolution on congested freeways
Experimental investigation of spatial breakdown evolution on congested freeways
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DOI：
10.1080/10286600701395593
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发表时间：
2007-10
影响因子：
1.8
通讯作者：
S. Bassan;A. Faghri;A. Polus
中科院分区：
文献类型：
--
作者：
S. Bassan;A. Faghri;A. Polus
虽然城市和郊区高速公路的设计是为了实现高速畅通，但在高峰时段，特别是交通需求高的时候，以及发生意外事故时，它们会出现交通拥堵。从自由流到击穿流的相变过程中，速度水平迅速下降，同时密度水平急剧上升，即为交通击穿。当速度和密度恢复到非拥堵条件下的故障前水平后，实现交通故障的恢复。本文基于弗吉尼亚州66号州际公路郊区路段的数据，评估了故障的空间依赖性，并调查了工作日之间故障时间的一致性。通过试验设计技术对地点和工作日效应进行了识别。通过速度-时间平面上的原始数据评估了过渡时间的空间依赖性，并利用冲击波线性传播原理进一步检验了过渡时间的空间依赖性。这两种方法通常是一致的，并产生类似的结果。
Although urban and suburban freeways are designed to enable smooth flow with high speed, they experience traffic congestion during peak day periods especially when traffic demand is high but also during unexpected incidents. Traffic breakdown is identified when there is a rapid drop in speed level and a simultaneous steep rise in density level during the phase transition from free-flow to breakdown flow. The recovery from traffic breakdown is achieved after speed and density return to their pre-breakdown level in the uncongested conditions. This paper evaluates the spatial dependency of breakdown and investigates the consistency of time of breakdown between weekdays, based on data collected from a suburban section of Interstate 66 in Virginia. The identification of location and weekday effects is conducted by experimental design techniques. The spatial dependency of the transition times is evaluated through raw data in the speed–time plane and further examined by the shockwave linear propagation principle. Both approaches are generally consistent and produce similar results.