二手市场治安管理信息系统

ABSTRACTAbstract:With the continuous development of China's social economy,the trafficproblem has become a prominent problem that can not be ignored.As China'spopulation pressure continues to increase,the demand for modernization intensifies,and urbanization expands day by day,one of the most important evaluation indexesof urban living standard and investment environment in China is whether thetransportation is convenient or not.The timing control system is used in most of thetraffic signal systems in China.However,due to its low traffic efficiency and trafficcongestion,this paper focuses on PCL technology and aims to study and design aneffective traffic control light signal system based on PCL technology.This system canimprove the traffic signal control system,which is especially crowded,and maintainthe order and safety of travel.Keywords:PLC;Traffic lights;control共页第页