【英文标准名称】:StandardTestMethodforFieldMeasurementofRaisedRetroreflectivePavementMarkersUsingaPortableRetroreflectometer
【原文标准名称】:使用便携式反射计现场测量凸起的反射路面标记的标准试验方法
【标准号】:ASTME1696-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E12.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:指示器;路面
【英文主题词】:portableretroreflectometers;raisedretroreflectivepavementmarkers;retroreflection
【摘要】:MeasurementsofRImadebythistestmethod,withthe0.2x00B0;observationangle,arerelatedtovisualobservationofraisedretroreflectivepavementmarkersatdistancesofapproximately220m(720ft)forcarsorapproximately440m(1440ft)fortruckswhenilluminatedbytungstenfilamentlightsourcessuchascarheadlights.Therearesomecastingsthatblockvehicleilluminationofaportionofthemarkermountedwithinit.Inthiscase,measuredRIcanbesignificantlylowerthanwhenthemarkerisphotometeredoutsidethecasting,butwillcorrespondtothevisualobservation.Thetestmethodisnotapplicabletoraisedpavementmarkersmountedindepressionscutintothepavement.Thecoefficientofluminousintensityofraisedretroreflectivepavementmarkersdegradeswithtrafficwearandrequiresperiodicmeasurementtoensurethatsufficientvisibilityisprovidedtothedriver.Thequalityofthepavementmarkersastomaterialsused,ageandwearpattern,willhaveaneffectonthecoefficientof(retroreflected)luminousintensity.Theseconditionsneedtobeobservedandnotedbytheuser.1.1Thistestmethodcoversthemeasurementoftheretroreflectivepropertiesofraisedretroreflectivepavementmarkersataprescribedgeometry,bymeansofaportableretroreflectometerthatcanbeusedinthefield.Themeasurementscanbecomparedtominimumrequirementstodeterminetheneedforreplacement.1.2TheobservationanglespecifiedforretroreflectometersinthistestmethodisthatcurrentlyspecifiedforraisedpavementmarkersintheUnitedStatesandmaydifferfromtheanglesusedelsewhere.Forotherjurisdictions,replacetheobservationsanglespecifiedhereinwiththeobservationanglespecifiedbythepertinentagency.1.3Thistestmethodisintendedtobeusedforfieldmeasurementofraisedretroreflectivepavementmarkersbutmayalsobeusedtomeasuretheperformanceofnewmarkersbeforetheyareplacedinthefield.1.4Thistestmethodcoversmeasurementsofraisedpavementmarkersmountedonaroadsurfaceormountedinsnow-plowablemetalcastings.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Thestandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P66
【国际标准分类号】:93_080_20
【页数】:4P.;A4
【正文语种】: