【英文标准名称】:StandardTestMethodforMeasurementofRetroreflectiveSignsUsingaPortableRetroreflectometerata0.5DegreeObservationAngle
【原文标准名称】:用手持式逆反射测量仪在0.5度的观测角度测量反光标志的标准试验方法
【标准号】:ASTME2540-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:
【英文主题词】:portableretroreflectometers;retroreflection
【摘要】:Measurementsmadebythistestmethodarerelatedtothenighttimebrightnessofretroreflectivetrafficsignsapproximatelyfacingthedriverofamid-sizedautomobileequippedwithtungstenfilamentheadlightsatabout100mdistance.Retroreflectivematerialusedontrafficsignsdegradeswithtimeandrequiresperiodicmeasurementtoensurethattheperformanceoftheretroflectionprovidesadequatesafetytothedriver.Thequalityofthesignastomaterialused,age,andwearpatternwillhaveaneffectonthecoefficientofretroreflection.Theseconditionsneedtobeobservedandnotedbytheuser.Thistestmethodisnotintendedforuseforthemeasurementofsignswhentheinstrumententranceandobservationanglesdifferfromthosespecifiedherein.1.1Thistestmethodcoversmeasurementoftheretroreflectivepropertiesofsignmaterialssuchastrafficsignsandsymbols(verticalsurfaces)usingaportableretroreflectometerthatcanbeusedinthefield.Theportableretroreflectometerisahand-heldinstrumentwithadefinedstandardgeometrythatcanbeplacedincontactwithsignmaterialtomeasuretheretroreflectioninastandardgeometry.Themeasurementscanbecomparedtominimumrequirementstodeterminetheneedforreplacement.EntranceandobservationanglesspecifiedinthistestmethodarethoseusedcurrentlyintheUnitedStatesandmaydifferfromtheanglesusedelsewhereintheworld.1.2Thistestmethodisintendedtobeusedforthefieldmeasurementoftrafficsignsbutmaybeusedtomeasuretheperformanceofmaterialsbeforeplacingthesigninthefieldorbeforeplacingthesignmaterialonthesignface.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:R86
【国际标准分类号】:93_080_40
【页数】:6P.;A4
【正文语种】:英语