交通转盘路口控制与非控制的效率分析——基于计算机仿真实验的比较

Efficiency of controlled and uncontrolled roundabouts a comparison based on computer experiments

基于计算机仿真实验，对具有交通灯控制和没有交通灯控制的交通转盘路口的交通效率进行了分析和比较．对有交通灯控制的情形（控制情形），由实验给出最优的绿灯控制时间．把等待队长作为交通强度的函数，并由图形给出相应的分析比较结果．在没有交通灯控制的情形（非控制情形），具有较高的事故概率，但分析表明它具有由等待队长度量的高效率．

Based on computer experiments, an analysis and a comparison of the efficiency of a roundabout once controlled by traffic lights (controlled case) and once without traffic lights (uncontrolled case) is given. For the controlled case the determination of the duration of the green phases is assumed to be optimal. The results are given by diagrams presenting the congestion lengths as function of the traffic intensities. In the uncontrolled case, which is known for a higher number of accidents, the analysis shows a clearly higher efficiency measured by the length of congestion. Moreover it is evident that the traffic in the controlled case collapses already at a much lower traffic intensity than in the uncontrolled one.