Designation:E1927−98(Reapproved2018)StandardGuideforConductingSubjectivePavementRideQualityRatings1ThisstandardisissuedunderthefixeddesignationE1927;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversaprocedureforobtainingsubjectivenumericalrideratingsforagroupofrepresentativehighwaypavementsectionshavingabroadspectrumofphysicalchar-acteristics.1.2Theintentofthisguideistodescribeaprocedureforgeneratingasetofcomparativelyscaledrideratings,subjec-tivelyderived,forasubgroupofpavementsectionshavingaridequalitydistributionapproximatingthegeneralpopulationofhighwaysofinterest.Thissetwillprovidestatisticalestimatesoftheaveragesubjectiverideratingswhichwouldbeobtainedforthesamegroupofpavementsectionsiftheentirepopulationofuserscouldbeinterrogated.1.3Forthedatatobeareasonablerepresentationoftheaverageridequalityjudgmentsofthetotalhighwayusercommunityforthetotalpopulationofhighwaypavements,certainsamplingtheorypreceptsmustbeobserved;thesizeoftheratingpanel,theselectionofitsmembersfromtheusercommunity,themethodofquantifyingtheindividualjudgments,aswellastheselectionofthesamplepavementsectionsareallimportantareastobeconsidered.1.4Animportantuseoftheresultingridequalitydatawouldbetodeterminetheabilityofvarioushypothesizeddetermin-isticfunctionsofphysicalparametersofthepavementsamples,suchasmeasuredlongitudinalprofile,andsoforth,toprovideanestimateofsubjectiveridequalityjudgments.1.5ThisguideisbasedonguidelinesdescribedinAppendixFofNCHRPReport275,2andinAppendixEofNCHRPReport308.31.6Thevaluesstatedinbothinch-poundandSIunitsaretoberegardedseparatelyasthestandard.Theunitsgiveninparenthesesareforinformationonly.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablisha...
