The information collection of traffic flow adopt the mean of unicast vehicles node receives the information and directly save the message and then process the information and obtain the vehicles density and the average speed on the current reverse road when the vehicles are drove away road .

车辆交通流信息的采集采用 单播 方式，车辆节点接收到信息后直接将消息 进行保存，之后在即将驶出道路时，基于这些信息计算出当前反向道路上的车辆密度和车辆平均速度。