信号交叉口起动波模型修正

Modification of Start-wave Model at Signalized Intersection

通过研究交通波理论中的起动波模型,发现传统起动波模型理论计算值与实际观测值偏差较大,认为导致传统起动波模型产生偏差的原因在于推导过程中采用了格林希尔治模型,因此论文采用格林伯模型对起动波模型进行了修正。修正后的起动波模型经交通调查数据检验,理论计算值与实际观测值近似相等,误差均不超过5%。修正后的起动波模型,可应用于信号交叉口车队起动过程分析和信号配时效果评价。

lids paper studies the start-wave model, finds the traditional model disagreeing with the practice, establishes a new startwave model and validates the new model by field data. It is Greenshields model, which is used in the deduction of the traditional startwave model, that results in the difference of the model from the practice. The state where a queue begins to discharge is with high density, which Greenshields model isn＇ t suitable to describe. Instead Greenherg model is fit for this state. Then the paper uses Greenherg model to modify the traditional start-wave model and sets up a new start-wave model. To collect field data, a special traffic survey scheme is designed. Using the field data, the paper calibrates the new model and verifies it. The start-wave velocity calculated by the new model is very close to the practice and all errors are less than 5 %. The new start-wave model can he used to analyze the starting process of a queue and to evaluate the effect of the signal timing schemes at signalized intersection.