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1、TrafficlightsandPLCWitheconomicdevelopment,increasedthenumberofvehicles,roadcongestionisbecomingincreasinglyserious,intelligenttrafficlightsontheemerged.Atpresent,theworld'sIntelligentTransportationSystemwillbe:ahugestructure,managementdifficulties,suchasthemaintenanceoflargeinputs.Inorder
2、toimprovetheexistingtrafficconditions,andtoovercometheexistingshortcomingsofintelligenttransportationsystemIdesignedanalogcontroltrafficlightsinurbanandruralareasofsmall-scalesmarttrafficlights.Ithassmallsize,intelligence,maintenanceintosmall,easytoinstallandsoon.Andotherintelligenttranspo
3、rtationsystemcomparedtothesystemtoadapttoeconomicandsocialdevelopment,inlinewiththecurrentstatusofscientificandtechnologicaldevelopment.Intelligenttrafficlightsareacomprehensiveuseofcomputernetworkcommunicationtechnology,sensortechnologytomanagetheautomaticcontrolsystemoftrafficlights.Urba
4、ntrafficcontrolsystemisusedforurbantrafficdatamonitoring,trafficsignalcontrolandtrafficmanagementcomputersystem;itisthemodernurbantrafficcontrolsystemcommandandthemostimportantcomponent.Inshort,howtousetheappropriatecontrolmethodtomaximizetheuseofcostlycitiestobuildhigh-speedroads,trunkroa
5、dandtheramptoalleviateurbanareaswiththeneighboringstateoftrafficcongestionhasbecomemoreandmoretrafficmanagementandurbanplanningdepartmentsneedtoaddressthethemainproblem.Nowadays, traffic lights installed in each crossing, has become the most common and dredge the traffic, the most effecti
6、ve 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 adopting effective method to control the traffic light is imperative. PLC intelligent control principle
7、 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 given the green light direction between north and south direction according to certain rules
