一种基于交通熵的交通流无序度量方法

交通流无序转化过程的研究需要对交通流无序进行定量的描述。为了定量描述交通流无序，通过对有序、无序概念的分析，给出了一种交通流无序的定义；在此基础之上，应用交通熵理论提出了一种交通流无序的度量模型，并应用该交通流无序度量模型对实际道路交通流无序阂值作了分析。计算了9种不同道路交通流的无序阈值，通过其结果比较分析，得出一个基本结论：当阈值N为1．10时，实际道路交通流为交通流无序状态。此时，车速一般小于设计车速的30％。该模型成功地解决了交通流无序度量问题，为交通流有序与无序之间的转化过程研究提供了理论基础。

A Measuring Method for Disorder Motion in Traffic Flow Based on Traffic Entropy

It is very important to quantitatively describe the disorder motion in traffic flow to study transition process between disorder motion and order motion. A definition of the disorder motion in traffic flow is given in order to quantitatively describe the disorder motion in traffic flow through analysing the concept of order motion and disorder motion. A measuring model of disorder motion in traffic flow is put forward based on traffic entropy.The model is applied to analysis the disorder motion in traffic flow and the thresholds of 9 actual tragic flows are calculated.Based on the thresholds of the calculated results, the traffic flow is in the disorder motion in traffic flow when the threshold N is 1.10 and the speed of the vehicle is less than 30% of the design speed of the vehicle.The model successfully solves the measure problem of the disorder motion in traffic flow and provides theoretical foundation to study transition process between disorder motion and order motion.