摘要
轻微拥挤状态下车流疏散的不利将导致交通状态的恶化,轻微拥挤将演变为严重拥挤。以轻微拥挤状态下的区域路网为研究对象,建立以路网饱和度方差最小为第1阶段目标,路网行驶花费最少为第2阶段目标的两阶段优化模型。优化模型采用Matlab进行求解。在求解第1阶段目标函数的同时,识别拥挤最严重的路径并作为拥挤疏散通道;求解第2阶段目标函数的同时,结合交通流相容性的概念,构建与拥挤疏散通道相容的畅通诱导通道,对流量进行合理诱导和分配。数值计算表明,此优化方法能够较好的解决拥挤区域的车辆疏散问题。
The slight congestion will led to over-crowded state because of inefficient traffic evacuation. Taken the regional road network in slight congestion state for example, a two-stage optimization model was put forward, in which the minimum saturation variance as the first-stage objective, and the lowest traffic cost as the second-stage objective. The objective function of the optimization model was solved by Matlab. The most congested traffic route was recognized as the evacuation route during the first-stage. Based on the concept of compatibility, the smooth guidance route compatible to the evacuation route was found out to reasonably guide and allocate the traffic volume during the second-stage. The results of numerical calculation show that the proposed method is effective and can solve the problem of traffic evacuation in traffic congested regions.
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第2期127-131,共5页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(50908051)
关键词
交通工程
拥挤疏散
2阶段优化
交通流
相容性
traffic engineering
congestion evacuation
two-stage optimization
traffic flow
compatibility
