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energiesArticleiABACUS:AWi-Fi-BasedAutomaticBusPassengerCountingSystemMicheleNitti1,2,∗,FrancescaPinna1,LuciaPintor1,VirginiaPilloni1,2,∗andBenedettoBarabino3,∗1DepartmentofElectricalandElectronicEngineering(DIEE),UniversityofCagliari,09123Cagliari,Italy;[email protected](F.P.);[email protected](L.P.)2NationalTelecommunicationInterUniversityConsortium(CNIT),ResearchUnitofCagliari,09123Cagliari,Italy3DepartmentofCivilEngineering,Architecture,Land,EnvironmentandMathematics(DICATAM),UniversityofBrescia,25123Brescia,Italy*Correspondence:[email protected](M.N.);[email protected](V.P.);[email protected](B.B.)Received:21February2020;Accepted:15March2020;Published:19March2020Abstract:SincetheearlystagesoftheInternet-of-Things(IoT),oneoftheapplicationscenariosthathavebeenaffectedthemostbythisnewparadigmismobility.SmartCitieshavegreatlybenefitedfromtheawarenessofsomepeople’shabitstodevelopefficientmobilityservices.Inparticular,knowinghowpeopleusepu...