基于IQA方法的信号交叉口左转延误计算

Left-turn Delay Computation at Signalized Intersection Based on Incremental Queue Accumulation

为了更科学地计算复杂交通流条件下的左转延误,分析了车辆到达和离去规律,采用排队增量累计(IQA)方法,提出基于IQA方法的信号交叉口计算左转延误计算模型,通过使用不规则的多边形来计算队列累积面积作为均匀延误值.该方法突破了Webster延误模型的条件限制,更好的描述了实际交通状况.结合福州市信号交叉口调查数据,验证了IQA方法计算的延误比Web-ster模型更符合实际,特别是许可型左转相位的信号交叉口.

In order to compute left-turn delay under complex traffic flow more scientific,the regulation of vehicles arrival and departure is analyzed.This paper proposes a new approach to calculating left-turn delay at signalized intersection based on the incremental queue accumulation（IQA） method.This method uses the cumulative area of the queue of irregular polygon as a uniform delay values.The method breaks Webster′s delay model conditions and description the actual traffic conditions better.The new method is tested using the field data colled at several signalized intersections in the city of Fuzhou.The IQA method is more realistic than the Webster＇s delay model,especially the permitted left-turn operation at signalized intersection.