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1、TrafficlightsandPLCWitheconomicdevelopment,increasedthenumberofvehicles,roadcongestionisbecomingincreasinglyserious,intelligenttrafficlightsontheemerged.Atpresent,theworld'sIntelligentTransportationSystemwillbe:ahugestructure,managementdifficulties,suchasthemaintenanceofla
2、rgeinputs.Inordertoimprovetheexistingtrafficconditions,andtoovercometheexistingshortcomingsofintelligenttransportationsystemIdesignedanalogcontroltrafficlightsinurbanandruralareasofsmall-scalesmarttrafficlights.Ithassmallsize,intelligence,maintenanceintosmall,easytoinstall
3、andsoon.Andotherintelligenttransportationsystemcomparedtothesystemtoadapttoeconomicandsocialdevelopment,inlinewiththecurrentstatusofscientificandtechnologicaldevelopment.Intelligenttrafficlightsareacomprehensiveuseofcomputernetworkcommunicationtechnology,sensortechnologyto
4、managetheautomaticcontrolsystemoftrafficlights.Urbantrafficcontrolsystemisusedforurbantrafficdatamonitoring,trafficsignalcontrolandtrafficmanagementcomputersystem;itisthemodernurbantrafficcontrolsystemcommandandthemostimportantcomponent.Inshort,howtousetheappropriatecontro
5、lmethodtomaximizetheuseofcostlycitiestobuildhigh-speedroads,trunkroadandtheramptoalleviateurbanareaswiththeneighboringstateoftrafficcongestionhasbecomemoreandmoretrafficmanagementandurbanplanningdepartmentsneedtoaddressthethemainproblem.Nowadays, traffic lights installed
6、in each crossing, has become the most common and dredge the traffic, the most effective means. The development of the society, people's consumption level unceasing enhancement, private vehicles unceasing increase. And more cars roads are narrow road traffic is clear. So a
7、dopting effective method to control the traffic light is imperative. PLC intelligent control principle is the core of the control system, PLC put the things direction or north-south direction according to quantity of vehicles, the corresponding scale what divides class giv
8、en the green light direction between north and south direction according to certain rules
