摘要
延误是评价交叉口服务水平的基本指标,延误模型对交叉口信号控制方案的选择意义重大.在多态交通条件下,采用现有模型分析信号控制下交叉口延误程度存在较大误差.为适应交叉口交通流的多态性,基于混合Gamma分布稠密性,准确拟合交叉口到达车头时距数据.运用拟合概率函数,统计交叉口进口到达交通量概率.将交叉口按照到达交通量大小分为欠饱和、过饱和两种状态,根据统计概率提出交叉口信号定时控制延误模型.实例分析表明,基于混合Gamma分布的延误与实际结果更为吻合.
The delay is the essential evaluation index of intersection service level,and delay model plays an important role in intersection signal timing.In the condition of multi-state traffic flow,the existing delay models possess a large error.In order to adapt to the multi-sate flow,arriving headway data of intersection is fit based on the denseness of mixture Gamma distribution,and the probability of traffic flow arriving at intersection is calculated by means of fit probability function.Furthermore,the intersections are separated into two classes with traffic flow,low saturation and over saturation,and intersection timing control delay model on the traffic flow statistic probability is put forward.Finally,a reality intersection is presented as an example,and the result shows that the delay calculated by the model based on mixture Gamma distribution is close to practice.
出处
《系统工程理论与实践》
EI
CSSCI
CSCD
北大核心
2012年第5期1091-1097,共7页
Systems Engineering-Theory & Practice
基金
国家自然科学基金(51178158,70771036,71071044)
中央高校基本科研业务费专项资金(2010HGZY0010)
