道路交叉口出现一些特殊交通情况时,交通信号灯仍然按正常的相位周期性工作,对交通流起不到良好的控制作用。针对这种情况,提出了一种道路交通信号现场实时控制方案,使用Android智能手机,通过Wi Fi无线传感网络向交通信号控制机发出控制指令,从而改变交通信号灯的工作状态,适应道路交叉口交通状况的要求。该方案的实施为现场交通值勤人员提供了方便、快捷地临时控制交通信号灯的方法。 When there are some special traffic conditions at the road intersection, the traffic lights will still work periodically according to the normal phase and will not be able to control the traffic flow well. In view of this situation, a real-time road traffic signal control scheme is proposed, which uses Android smartphone to send control commands to the traffic signal controller via Wi Fi wireless sensor network to change the working status of the traffic light and adapt to the intersection Traffic conditions. The implementation of the program provides on-site traffic staff on duty to provide a convenient, fast and temporary control of traffic lights.