Designation:E2300−09StandardSpecificationforHighwayTrafficMonitoringDevices1ThisstandardisissuedunderthefixeddesignationE2300;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationdescribestherecommendedproce-dureforidentifyingtheperformanceandoperatingrequire-mentstobeincludedinapurchaseorderforTrafficMonitoringDevices.Assuch,thespecificationcanbereferencedbytheuserandsellerwhendeterminingcompliancewitheachspeci-fiedrequirement.ItistheintentofthisspecificationtohavetheuserrequirethesellertoprovideevidencethatthebrandandmodelofTMDofferedbythesellerhaspassedanapplicableType-approvalTest.IftheTMDhasnotpreviouslypassedaType-approvalTest,thenitistheintentofthisspecificationtohavethedevicetype-approvedbeforeitisacceptedbytheuser.IftheTMDhaspreviouslypassedaType-approvalTest,thenthisspecificationrequiresthattheproductionversionofthedeviceprovidedbythesellerpassanOn-siteVerificationTestbeforebeingacceptedbytheuser.1.2TraffıcMonitoringDevice—ATrafficMonitoringDe-vice(TMD)isequipmentthatcountsandclassifiesvehiclesandmeasuresvehicleflowcharacteristicssuchasvehiclespeed,laneoccupancy,turningmovements,intervehiclegaps,andotherparameterstypicallyusedtoportraytrafficmove-ment.TMDsusuallycontainasensingelementthatconvertsthesignal-generatingphenomenon(suchas,airpulsegeneratedbyavehicletirepassingoverapneumatictube)intoanelectricalsignalandelectronicsthatamplify,filter,andother-wiseconditionthesignal.SomeTMDsprovideoutputsasrelayorsolid-stateswitchclosures,whileotherscontainsignalprocessingthattranslatesthesignalintotherequiredvehicleandvehicleflowdata.TMDswhoseoutputsarerelayorsolidstateswitchclosuresmaybeconnectedtoroadsidecontrollers,whichprocesstheswitch-closureinformationandconvertitintovehicleflowdata.1.3CharacterizationofTraffıcMonitoringDevi...
