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既有研究已经论证高速公路独有的运营特点,包括双能力现象.双能力现象表明,高速公路在自由运行(非排队式)条件下比在排队条件下具有更大能力.在孤立的匝道区,双能力现象的存在,决定了匝道控制在减缓高速公路和匝道交通延迟的效率.本文进一步探讨了微观仿真模型(VISSIM)是否能够在分析现象有关特征的基础上,校准复制双能力现象.本文指出,微观模拟模型用于研究匝道控制延误评价时,必须具有再现双能力现象的能力,否则就会得到错误的结论.本文发现大多数微观模拟模型,例如VISSIM,尽管使用了传统的跟弛理论,但不能自动展示双能力现象.然而,如果在VISSIM中使用一组特殊的编码参数就能再现双能力现象.利用VISSIM模型,本文分析了匝道控制和双能力现象的特征,发现匝道控制减小了双能力值的差距,尤其是采用排队政策时.由于高速公路在自由运行状态下的能力难以评估,本文建议可用有排队状态下的能力值来代替.
Existing research has demonstrated the unique operating characteristics of freeways, including the dual-capacity phenomenon, which shows that freeways have greater capacity than free-running (non-queuing) conditions than queuing conditions.In isolated ramp areas , The existence of dual-ability phenomenon determines the efficiency of ramp control in alleviating the traffic delays of freeways and on-ramps.This paper further explores whether the microscopic simulation model (VISSIM) can calibrate the duplicate duality phenomenon based on the analysis of the relevant features of the phenomenon. It is pointed out that the micro-simulation model must be capable of reproducing the dual-capacity phenomenon when it is used to study the evaluation of ramp control delay, otherwise, it will lead to the wrong conclusion.It is found that most microscopic simulation models such as VISSIM use the traditional relaxation theory , But can not automatically show the dual ability phenomenon.However, if using a special set of encoding parameters in VISSIM can reproduce the dual-capacity phenomenon.Using the VISSIM model, this paper analyzes the characteristics of the ramp control and dual-capacity phenomenon, found that the ramp control is reduced The gap between the dual-value, especially when using queuing policy.As the freeway running in the state Difficult to assess the ability, the ability to be used herein recommended value in the queued state instead.