城市快速路交通状态转变时刻确定方法研究

Study on the Method of Traffic State Change Time on Urban Expressway

研究了城市快速路交通状态转变时刻的确定方法。在分析快速路拥挤状态和不拥挤状态交通流参数特性的基础上,根据Dganzo等提出的交通流参数调整累计曲线,设计了一种用于确定交通状态转变时刻的方法:利用流量和时间占有率两个参数的调整累计曲线来判定快速路交通状态转变时刻。论文利用北京快速路系统的调查数据检验了该方法,得出的交通状态转变时刻与实际情况相符,证实了该方法的有效性。交通拥挤转变时刻的确定可以应用于道路交通状态判别、交通波理论研究以及现有交通事件检测方法的技术评价。

A method of defining traffic state change time on urban expressway is studied. Traffic situation on the expressway is analyzed under two states： congestion and non-congestion. In accordance with the traffic flow parameter adjustment accumulative curve by Dganzo, a new method for defining traffic state change time is put forward.That is, traffic state change time is judged by using adjustment accumulative curve of flow and occupancy on urban expressway. By applying the field data obtained from some expressways in Beijing, traffic state change time by the method meets the real situation, which confirms the validity of the method. This method can be used in identifying road traffic condition, studying traffic wave theory and evaluating incident detection.