基于DEA/AHP的快速路出入口间距仿真评价方法研究

Evaluating Intervals Between On-and Off-ramp Through Simulation Based on DEA & AHP

合理设置城市快速路出入口间距对交通运行效率影响显著,间距过大不能满足周边网络的交通需求;反之,则短途交通流比例增大,出入口区域车辆交织频繁、互相干扰,严重影响交通效率,甚至造成交通拥堵。提出一种评价快速路出入口间距合理性的方法,在交通仿真模型基础上,引入DEA/AHP二阶段评价过程,既可对交通问题进行真实地再现分析,也可克服传统评价过程中存在的指标非均一性、量纲不统一以及指标权重确定过于主观的缺点。通过不同设置形式出入口的仿真案例分析,获得与既有文献中计算值基本吻合的结果。

Appropriate intervals between on-and off-ramps along urban expressway are much crucial to the high efficiency of traffic operations.Overlong intervals may not meet the travel demand from peripheral originals and destinations,whereas short intervals could lead to a great number of weaving vehicles and their disorder,even congestions,due to the increasing short distance traffic flow.An evaluated method based on DEA and AHP will be proposed to ensure the properness of intervals between ramps.It not only provides a practical analysis on traffic issues,but also avoids uniformity and different dimension,subjectivity of calculating weight value of index during employing existing methods.The simulation results from case studies are comparatively consistent with those from analytical methods.