ASTM_D_7585_-_D_7585M_-_10.pdf

Designation:D7585/D7585M10Standard Practice forEvaluating Retroreflective Pavement Markings UsingPortable Hand-Operated Instruments1This standard is issued under the fixed designation D7585/D7585M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes several field techniques to evalu-ate the retroreflective properties of pavement markings con-taining retroreflecting optics(for example,centerlines andedgelines)and applied to the road surface.The techniquesdescribed in this practice contain sampling criteria such as thelength of test sections and the number of measurementsneeded.The practice is based on retroreflective measurementsmade with portable hand-operated instruments in compliancewith Test Method E1710.1.2The data obtained from this practice can be used todetermine the acceptance or rejection of a project based onspecified levels of retroreflectivity established by the agencyhaving jurisdiction.1.3 This practice can be used for the evaluation of newlyinstalled or existing pavement markings.When testing newlyapplied pavement markings,it is recommended that the evalu-ation be done no sooner than 48 hours after application butbefore 30 days after application so that excess retroreflectiveoptics,such as glass spheres,are no longer present.1.4 The assessment techniques in this practice are based onbest practices and designed to provide three levels of confi-dence in terms of quantifying the retroreflective performanceof markings.Each technique represents a tradeoff between thenumber of measurements and the confidence of the retroreflec-tive performance of the markings under study.1.5 This practice can be used by agencies as is or may becustomized to meet an agencys specific needs.Whereapplicable,the practice describes areas where different as-sumptions could be made,which would impact the samplingneeds and the confidence levels of the results.When deviationsfrom this practice are made,they shall be documented in thetest report.NOTE1When measuring newly installed pavement markings,thereare several factors that contribute to erroneous values for measurementsmade within a short time after application,such as excess retroreflectiveoptics,top-coatings on tape,incomplete curing of the binder,and coatingson the retroreflective optics.Retroreflective measurements taken within 48h after application may be useful to quickly gauge the application qualitybut are not intended to be used with this practice.NOTE2When measuring existing or in-service pavement markings,care should be taken so that representative sections of pavement markingsare measured.There are particular conditions where excessive pavementmarking wear can be associated with a specific cause such as vehicletracking along horizontal curves,access points to gravel pits,and highweave areas.Pavement markings can also collect dirt,grime,and debris.1.6 This practice replaces Test Method D6359 with amulti-level strategy for evaluating the retroreflectance of pave-ment marking materials.This change was desired to provideagencies with options for project acceptance and monitoring ofpavement markings during service.1.7 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4061 Test Method for Retroreflectance of Horizontal Coat-ingsD6359 Specification for Minimum Retroreflectance ofNewly Applied Pavement Marking Using Portable Hand-Operated Instruments(Withdrawn 2006)3E284 Terminology of AppearanceE808 Practice for Describing Retroreflection1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.38 onHighway Traffic Control Materials.Current edition approved Aug.1,2010.Published August 2010.DOI:10.1520/D758510.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 E1710 Test Met