Designation:E1845−15StandardPracticeforCalculatingPavementMacrotextureMeanProfileDepth1ThisstandardisissuedunderthefixeddesignationE1845;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthecalculationofmeanprofiledepthfromaprofileofpavementmacrotexture.1.2Themeanprofiledepthhasbeenshowntobeusefulinpredictingthespeedconstant(gradient)ofwetpavementfriction.21.3AlineartransformationofthemeanprofiledepthcanprovideanestimateofthemeantexturedepthmeasuredaccordingtoTestMethodE965.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3E178PracticeforDealingWithOutlyingObservationsE965TestMethodforMeasuringPavementMacrotextureDepthUsingaVolumetricTechnique2.2ISOStandard:ISO13473-1Acoustics—CharacterizationofPavementTextureusingSurfaceProfiles–Part1:DeterminationofMeanProfileDepth43.Terminology3.1Definitions:3.1.1baselength,n—lengthofasegmentofapavementmacrotextureprofilebeinganalyzed,requiredtobe100mminthispractice.3.1.2estimatedtexturedepth(ETD),n—estimateofthemeantexturedepth(MTD),bymeansofalineartransforma-tionofthemeanprofiledepth(MPD).3.1.3meanprofiledepth(MPD),n—averageofallthemeansegmentdepthsofallofthesegmentsoftheprofile.3.1.4meansegmentdepth,n—averagevalueoftheprofiledepthofthetwohalvesofasegmenthavingagivenbase-length.3.1.5meantexturedepth(MTD),n—meandepthofthepavementsurfacemacrotexturedeterminedbythevolumetrictechniqueofTestMethodE965.3.1.6profiledepth(PD),n—differencebetweentheampli-tudemeasure...
