Designation:E1318−09StandardSpecificationforHighwayWeigh-In-Motion(WIM)SystemswithUserRequirementsandTestMethods1ThisstandardisissuedunderthefixeddesignationE1318;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Weigh-In-Motion—ThisspecificationdescribesWeigh-In-Motion(WIM),theprocessofmeasuringthedynamictireforcesofamovingvehicleandestimatingthecorrespondingtireloadsofthestaticvehicle.Gross-vehicleweightofahighwayvehicleisdueonlytothelocalforceofgravityactinguponthecompositemassofallconnectedvehiclecomponents,andisdistributedamongthetiresofthevehiclethroughconnectorssuchassprings,motiondampers,andhinges.HighwayWIMsystemsarecapableofestimatingthegrossweightofavehicleaswellastheportionofthisweight,calledloadinthisspecification,thatiscarriedbythetiresofeachwheelassembly,axle,andaxlegrouponthevehicle.1.2OtherTraffıcData—Ancillarytrafficdataconcerningthespeed,laneofoperation,dateandtimeofpassage,numberandspacingofaxles,andclassification(accordingtoaxlearrangement)ofeachvehiclethatisweighedinmotionisdesiredforcertainpurposes.ItisfeasibleforaWIMsystemtomeasureorcalculatethesetrafficparametersandtoprocess,summarize,store,display,record,hard-copy,andtransmittheresultingdata.Furthermore,differencesinmeasuredorcalcu-latedparametersascomparedwithselectedcontrolcriteriacanbedetectedandindicatedtoaidenforcement.Inadditiontotire-loadinformation,aWIMsystemiscapableofproducingall,orspecifiedportionsof,thesetrafficdata.1.3StandardSpecification—HighwayWIMsystemsgener-allyhavethreeapplications:collectingstatisticaltrafficdata,aidingenforcement,andenforcement.Thisspecificationclas-sifiesfourtypesofWIMsystemsaccordingtotheirapplicationanddetailstheirrespectivefunctional,performance,anduserrequirements.Itisaperformance-type(endproduct-type)specification.Exceptionsan...
