Transition and saturation of traffic flow controlled by traffic lights
Transition and saturation of traffic flow controlled by traffic lights
复制标题
DOI：
10.1016/s0378-4371(03)00148-1
复制
发表时间：
2003-07
影响因子：
3.3
通讯作者：
M. Sasaki;T. Nagatani
中科院分区：
文献类型：
--
作者：
M. Sasaki;T. Nagatani
利用最优速度模型研究了单车道上交通灯控制的交通流。分析了简单同步、绿色波和随机切换三种交通灯控制策略下的交通流特性。计算了三种不同策略下的电流密度图。发现在临界密度处电流发生饱和。动态转换的临界密度取决于交通灯的周期时间和策略。饱和电流的值不依赖于周期时间和策略。当水流饱和时，出现向后传播的密度波。结果表明，密度波与自发堵塞是一致的。本文还对这种动态转变进行了理论分析。
We study the traffic flow controlled by traffic lights on a single-lane roadway by using the optimal velocity model. The characteristic of traffic flow is clarified for the three different strategies of traffic light control: the simple synchronized, green wave, and random switching strategies. The current–density diagrams are calculated for the three different strategies. It is found that the saturation of current occurs at the critical density. The critical density of the dynamical transition depends on the cycle time of the traffic light and strategy. The value of the saturated current does not depend on the cycle time and the strategies. The density wave propagating backward appears when the current saturates. It is shown that the density wave is consistent with the spontaneous jam. A theoretical analysis is also presented for the dynamical transition.