现有研究虽然有针对性地提出了一些环形交叉口流向流量分析方法,但在应用中仍存在一定的局限性,对一些复杂的大型环形交叉口无能为力。基于此,借助OD反推技术,提出了一种环形交叉口流向流量分析模型,它通过反复迭代,以右转车流量为精度控制条件,反推出环形交叉口各流向交通流量。案例分析表明,该模型具有广泛的适用性和较高的精度,实用性强,计算过程简单,能有效解决环形交叉口各流向流量的交通调查问题。 Although some existing studies have pointed out some methods of traffic flow analysis at the roundabout, there are still some limitations in the application, which can not be done to some complex large roundabouts. Based on this, a traffic flow analysis model of roundabout is proposed by means of OD backstepping technology. It iteratively iterates, turns right traffic flow into precision control condition, and deduces traffic flow at each roundabout. The case study shows that the model has wide applicability and high precision, strong practicability, simple calculation process and can effectively solve the traffic investigation problems of traffic flow at the roundabout.