城市道路固定型交通检测器布局优化模型

Optimal Module for Layout of Fixed Type Traffic Decector on Urban Roads

交通信息采集是智能交通系统的重要基础,准确、可靠的数据是动态交通管理、控制的重要保障。分析影响检测器布局的因素,主要包括交通流的特性、道路交通环境、居民出行路径的选择等,提出基于检测器利用率最优的规划模型。探讨模型参数的计算方法,根据观测样本的均值和方差计算交通量波动系数,用最短路径法计算路段客观重要度。阐述模型的求解过程,通过比较几种传统优化算法的优缺点,设计改进隐枚举算法,并给出具体步骤。

Traffic information acquisition is a significant basis for intelligent traffic system, and accurate and reliable data are an important guarantee for dynamic traffic administration and control. This paper analyzes factors influencing layout of detectors including characteristics of traffic flow, traffic environment of expressway and residents＇ choices for trip paths, ere, and puts forward a planning model based on utilization rate of detectors in priority. The paper also probes into methods for calculating model parameters, e.g. calculating coefficient of fluctuation of traffic volume according to means and variances of observed samples and calculating the objective importance of sections of expressway by means of the Shortest path algorithm. Furthermore, the paper expatiates the solving process of model and designs improved implicit enumeration algorithm by comparing advantages and disadvantages of a few traditional optimal algorithms and presents definite steps.